<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                         FORM 10-KSB/A (AMENDMENT NO. 1)

         ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
                              EXCHANGE ACT OF 1934
                  For the Fiscal Year Ended September 30, 2000

                          Commission File No.2-95626-D


                               SIONIX CORPORATION
                 (Name of small business issuer in its charter)

                 UTAH                                       87-0428526
    (State or other jurisdiction of                     (I.R.S. Employer
     incorporation or organization)                   Identification Number)

    9272 JERONIMO ROAD, SUITE 108, IRVINE, CA                 92618
    (Address of principal executive offices)                (Zip Code)

         Issuer's Telephone Number: (949) 454-9283

         Securities registered under Section 12(b) of the Exchange Act:

                                      NONE

         Securities registered under Section 12(g) of the Exchange Act:

                     COMMON STOCK, PAR VALUE $.001 PER SHARE
                                (Title of Class)

     Check whether the issuer (1) filed all reports required to be filed by
Section 12 or 15(d) of the Exchange Act during the past 12 months (or for such
shorter period that the registrant was required to file such reports), and (2)
has been subject to such filing requirements for the past 90 days.
Yes [X] No [ ]

     Check if there is no disclosure of delinquent filers in response to Item
405 of Regulation S-B is contained in this form, and no disclosure will be
contained to the best of registrant's knowledge, in definitive proxy or
information statements incorporated by reference in Part III of this Form 10-KSB
or any amendment to this Form 10-KSB. [X]

     The issuer's revenues for the year ended September 30, 2000 were $0.

     The aggregate market value of the voting stock held by non-affiliates as of
September 30, 2000, computed based on the average of the bid and ask prices
reported on the OTC Bulletin Board, was $33,014,776.

     As of September 30, 2000, there were 54,166,322 shares of Common Stock of
the issuer outstanding.

     Documents Incorporated by Reference: NONE

     Transitional Small Business Disclosure Format (Check one):
Yes [ ] No [X]

<PAGE>   2

ITEM 6. MANAGEMENT'S DISCUSSION AND ANALYSIS OR PLAN OF OPERATION.

        General.

        As of September 30, 2000, the Company had an accumulated deficit of
$8,168,751. It can be expected that the future operating results will continue
to be subject to many of the problems, expenses, delays and risks inherent in
the establishment of a new business enterprise, many of which the Company cannot
control.

        The Company has formulated its business plans and strategies based on
certain assumptions of the Company's management regarding the size of the market
for the products the Company will be able to offer, the Company's anticipated
share of the market, and the estimated prices for and acceptance of
the Company's products. Although these plans and assumptions are based on the
best estimates of management, there can be no assurance that these assessments
will prove to be correct. No independent marketing studies have been conducted
on behalf of or otherwise obtained by the Company, nor are any such studies
planned. Any future success that the Company might enjoy will depend upon many
factors, including factors which may be beyond the control of the Company or
which cannot be predicted at this time. These factors may include product
obsolescence, increased levels of competition, including the entry of additional
competitors and increased success by existing competitors, changes in general
economic conditions, increases in operating costs including cost of supplies,
personnel and equipment, reduced margins caused by competitive pressures and
other factors, and changes in governmental regulation imposed under federal,
state or local laws.

        The Company's operating results may vary significantly due to a variety
of factors, including changing customers profiles, the availability and cost of
raw materials, the introduction of new products by the Company or its
competitors, the timing of the Company's advertising and promotional campaigns,
pricing pressures, general economic and industry conditions that affect customer
demand, and other factors.

        Results of Operations (Year Ended September 30, 2000 Compared to Year
Ended September 30, 1999). During the 2000 fiscal year the focus of the
Company's efforts have been on development of the Company's hardware products,
and preparation for
commencement of manufacturing and distribution. The immediate focus is on the
DAF (Dissolved Air Flotation), Automatic Back-Flush Filtration System, O-Zone
Mixing Chamber and other related products, some of which have their own separate
markets.

        The Company is continuing its engineering focus on hardware and water
filtration equipment. The Company has completed several phases of testing, and
is currently previewing its products with experienced treatment plant managers
and certified operators to gauge their level of acceptance. The Company has also
been working with Hoffinger Industries, its joint venture partner, to prepare
for manufacturing of the products. Also, the Company has arranged for lease and
maintenance financing for its product lines.

         The purpose of the joint venture is to accelerate production of the
Company's products by enlisting an established manufacturer, the Environmental
Products Division of Hoffinger Industries, to undertake much of the
manufacturing of the product, as well as marketing and distribution functions.
The Company will manufacture certain key components. The Environmental Products
Division of Hoffinger Industries manufactures industrial and commercial
filtration products. The Company is entitled to 51% of the profits and losses of
the joint venture, and Hoffinger is entitled to 49%. Following expiration of the
two-year term of the joint venture, the Company is entitled to all assets of the
joint venture, and Hoffinger is to receive a non-exclusive license to distribute
the products of the joint venture, with the right to purchase products at a 10%
discount.

<PAGE>   3

        For the year ended September 30, 2000, the Company reported a loss of
$2,414,188, or $.07 per share. This compares with a loss of $1,158,755 (as
restated) or $.04 per share for the year ending September 30, 1999. The increase
in the loss is principally due to expense accruals in connection with stock
compensation paid to officers and employees, as well as increased research and
development expenses.

        Liquidity and Capital Resources. On September 30, 2000, the Company had
cash and cash equivalents of approximately $279,999. The principal source of
liquidity has been sales of securities. Management anticipates that additional
capital will be required to finance the Company's operations. The Company
believes that anticipated proceeds from sales of securities, plus expected cash
flow from operations towards the end of the fiscal year, will be sufficient to
finance the Company's operations at currently anticipated levels for a period of
at least twelve months. However, there can be no assurance that the Company will
not encounter unforeseen difficulties that may deplete its capital resources
more rapidly than anticipated. Also, the Company may not be able to generate
revenues from operations during the fiscal year.

<PAGE>   4

Item 7. Financial Statements


               REPORT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS


Board of Directors and Stockholders
Sionix Corporation
(A Development Stage Company)

We have audited the accompanying balance sheet of Sionix Corporation (a
development stage company) (the "Company") as of September 30, 2000, and the
related statements of operations, stockholders' equity (deficit) and cash flows
for the year then ended. These financial statements are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
financial statements based on our audit.

We conducted our audit in accordance with generally accepted auditing standards.
Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes, on a test basis, examination of evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall consolidated financial
statement presentation. We believe that our audit provides a reasonable basis
for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Sionix Corporation (a
development stage company) as of September 30, 2000, and the results of its
operations and its cash flows for the year then ended in conformity with
generally accepted accounting principles.

The accompanying financial statements have been prepared assuming that the
Company will continue as a going concern. As discussed in Note 14 to the
financial statements, the Company has incurred significant losses since its
inception and lacks the capital necessary to pursue its operating plan. These
conditions raise substantial doubt about the Company's ability to continue as a
going concern. Management's plans regarding these matters are also described in
Note 14. The financial statements do not include any adjustments that might
result from the outcome of this uncertainty.

As discussed in Notes 2 and 8, the Company restated the financial statements
referred to above.



                                         /s/ CACCIAMATTA ACCOUNTANCY CORPORATION

Irvine, California
April 5, 2001


<PAGE>   5
                               SIONIX CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
                                  BALANCE SHEET

<TABLE>
<CAPTION>
                                                                    SEPTEMBER 30,
                                                                        2000
                                                                    -------------
<S>                                                                 <C>
                                    ASSETS
CURRENT ASSETS:

  Cash                                                               $   279,999
  Restricted cash                                                        100,000
                                                                     -----------
    Total current assets                                                 379,999
  Equipment                                                               34,564
  Patents                                                                 94,741
  Deposits                                                                 6,831
                                                                     -----------
                                                                         516,135
                                                                     ===========

                    LIABILITIES AND STOCKHOLDERS' DEFICIT

CURRENT LIABILITIES:
  Notes payable                                                      $    50,000
  Notes payable - related parties                                        327,351
  Accrued interest                                                        32,313
  Accrued interest - related parties                                      83,901
  Accounts payable                                                         7,872
  Accrued expenses                                                        24,933
                                                                     -----------
    Total current liabilities                                            526,370
                                                                     -----------

COMMITMENTS AND CONTINGENCIES                                                 --

STOCKHOLDERS' DEFICIT:

  Common stock $0.001 par value; 100,000,000 shares authorized,
    54,166,322 shares issued and outstanding                              54,166
  Additional paid-in capital                                           8,104,350
  Deficit accumulated during the development stage                    (8,168,751)
                                                                     -----------
    Total stockholders' deficit                                          (10,235)
                                                                     -----------
                                                                     $   516,135
                                                                     ===========
</TABLE>

   THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS.



<PAGE>   6

                               SIONIX CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
                      STATEMENTS OF OPERATIONS -- RESTATED


<TABLE>
<CAPTION>

                                                                                  CUMULATIVE
                                                     YEAR ENDED                  FROM INCEPTION
                                                    SEPTEMBER 30,              (OCTOBER 3, 1994)
                                           -------------------------------      TO SEPTEMBER 30,
                                               2000               1999               2000
                                           ------------       ------------     -----------------
<S>                                        <C>                <C>              <C>
COSTS AND EXPENSES:
  General and administrative               $  2,169,362       $  1,072,719       $  5,600,337
  Research and development                      182,308              7,085          1,039,746
  Write off of obsolete intangibles                  --                 --          1,040,865
  Depreciation and amortization                  51,847             49,095            325,702
                                           ------------       ------------       ------------
OPERATING LOSS                               (2,403,517)        (1,128,899)        (8,006,650)
                                           ------------       ------------       ------------
OTHER INCOME (EXPENSE):
  Interest income                                24,440              8,283             32,723
  Interest expense -  related parties           (31,111)           (34,139)           (83,901)
  Interest expense                               (4,000)            (4,000)          (110,923)
                                           ------------       ------------       ------------
                                                (10,671)           (29,856)          (162,101)
                                           ------------       ------------       ------------
NET LOSS                                   $ (2,414,188)      $ (1,158,755)      $ (8,168,751)
                                           ============       ============       ============
BASIC AND DILUTED NET LOSS PER SHARE       $      (0.05)      $      (0.03)
                                           ------------       ------------
BASIC AND DILUTED WEIGHTED AVERAGE
 NUMBER OF SHARES OUTSTANDING                49,861,728         36,260,775
                                           ============       ============
</TABLE>

   THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS.



<PAGE>   7

                               SIONIX CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
                            STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                                              CUMULATIVE
                                                                  SEPTEMBER 30,             FROM INCEPTION
                                                          -----------------------------    (OCTOBER 3, 1994)
                                                             2000              1999      TO SEPTEMBER 30, 2000
                                                          -----------       -----------  ---------------------
                                                                             RESTATED           RESTATED
                                                                            -----------  ---------------------
<S>                                                       <C>               <C>               <C>
Cash flows from operating activities:
   Net loss                                               $(2,414,188)      $(1,158,755)      $(8,168,751)
   Adjustments to reconcile net loss to net cash
      used by operating activities:
      Depreciation and amortization                            51,847            49,095           325,702
      Common stock issued for compensation                  1,220,116           392,925         1,833,041
      Common stock issued for services                        254,287           216,035           774,653
      Write-down of obsolete assets                            38,862                --            38,862
      Write-down of intangible assets                              --                --         1,040,865
      Other                                                                     (19,522)           57,351
   Change in assets and liabilities:
      Other assets                                              1,164            (1,164)               --
      Deposits                                                 30,400           (30,400)           (6,831)
      Accounts payable                                        (11,023)         (115,334)            7,872
      Accrued interest - related parties                       31,110             7,261            83,901
      Accrued interest                                          4,000             4,000            32,313
      Accrued expenses                                        (28,752)          (47,030)           24,933
                                                          -----------       -----------       -----------
         Net cash used by operating activities               (822,177)         (702,889)       (3,956,089)
                                                          -----------       -----------       -----------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchase of patents                                              --                --          (135,033)
  Purchase of equipment                                        (3,635)          (49,875)         (214,227)
                                                          -----------       -----------       -----------
         Net cash used by investing activities                 (3,635)          (49,875)         (349,260)
                                                          -----------       -----------       -----------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from issuance of notes                                  --                --            50,000
  Proceeds from issuance of notes to related parties               --                --           345,773
  Payments of notes to related parties                         (9,000)          (12,305)          (18,422)
  Purchase of certificate of deposit                         (100,000)               --          (100,000)
  Issuance of common stock for cash                         1,030,350           938,300         4,307,997
                                                          -----------       -----------       -----------
         Net cash provided by financing activities            921,350           925,995         4,585,348
                                                          -----------       -----------       -----------
Net increase in cash                                           95,538           173,231           279,999

CASH, BEGINNING OF PERIOD                                     184,461            11,230                --
                                                          -----------       -----------       -----------
CASH, END OF PERIOD                                       $   279,999       $   184,461       $   279,999
                                                          ===========       ===========       ===========
SUPPLEMENTAL DISCLOSURES OF NON-CASH
  INVESTING AND FINANCING ACTIVITIES:
     Acquisition of intangibles for debt                  $        --       $        --       $ 1,185,475
     Conversion of debt to equity                         $        --       $        --       $ 1,165,953

Cash paid for:
  Interest                                                $        --                --       $     2,134
  Income taxes                                            $        --                --       $        --
</TABLE>

   THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS.



<PAGE>   8

                               SIONIX CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
            STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) -- RESTATED
           FROM INCEPTION (OCTOBER 3, 1994) THROUGH SEPTEMBER 30, 2000

<TABLE>
<CAPTION>
                                                      COMMON STOCK                                           DEFICIT
                                              ------------------------------                               ACCUMULATED     TOTAL
                                                               AMOUNT           ADDITIONAL                 DURING THE  STOCKHOLDERS'
                                               NUMBER OF  ------------------     PAID-IN    SUBSCRIPTION   DEVELOPMENT    EQUITY
                                                SHARES    PER SHARE   TOTAL      CAPITAL     RECEIVABLE       STAGE      (DEFICIT)
                                              ----------  ---------  -------    ----------  ------------   ----------- -------------
<S>                                          <C>          <C>        <C>        <C>         <C>            <C>            <C>
BALANCE, OCTOBER 3, 1994                              --       --    $   --     $      --   $        --    $        --    $      --

Issuance of common stock for cash - October
1994                                              10,000     0.01        10            90            --             --          100
Net loss, October 3, 1994 to December 31,
1994                                                  --       --         -            --            --         (1,521)      (1,521)
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
BALANCE, DECEMBER 31, 1994                        10,000       --        10            90            --         (1,521)      (1,421)
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
Issuance of common stock for assignment
rights - January 1995                          1,990,000       --     1,990        (1,990)           --             --           --
Issuance of common stock for services -
January through March 1995                       572,473     0.25       572       135,046            --             --      135,618
Issuance of common stock for debt -
February 1995                                    188,561     0.25       188        47,347            --             --       47,535
Issuance of common stock for debt - April
1995                                             595,860     0.50       596       297,334            --             --      297,930
Issuance of common stock for debt - May
1995                                              98,194     2.00        98       196,290            --             --      196,388
Issuance of common stock for debt - June
1995                                             156,025     4.00       156       623,944            --             --      624,100
Issuance of common stock for cash - June
through September 1995                           138,040     4.00       138       552,022            --             --      552,160
Issuance of common stock for cash - October
through December 1995                             94,517     6.00        95       567,005            --             --      567,100
Issuance of common stock for subscription
note receivable - September 1995                 414,200     4.00       414     1,652,658    (1,656,800)            --       (3,728)
Issuance of common stock for future produc-
tion costs - October 1995                        112,500     6.00       113       674,887      (675,000)            --           --
Net loss                                              --       --        --            --            --       (914,279)    (914,279)
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
BALANCE, DECEMBER 31, 1995                     4,370,370       --     4,370     4,744,633    (2,331,800)      (915,800)   1,501,403
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
Issuance of common stock in reorganization
- January 1996                                18,632,612       --    18,633       (58,033)           --             --      (39,400)
Issuance of common stock for cash - March
through September 1996                           572,407     1.00       573       571,834            --             --      572,407
Issuance of common stock for services -
September 1996                                    24,307     1.00        24        24,283            --             --       24,307
Net loss, nine months ended September 30,
1996                                                  --       --        --            --            --       (922,717)    (922,717)
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
BALANCE, SEPTEMBER 30, 1996                   23,599,696       --    23,600     5,282,717    (2,331,800)    (1,838,517)   1,136,000
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
</TABLE>
                                                                     (Continued)

   THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS.



<PAGE>   9

                               SIONIX CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
            STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) -- RESTATED
           FROM INCEPTION (OCTOBER 3, 1994) THROUGH SEPTEMBER 30, 2000

<TABLE>
<CAPTION>
                                                      COMMON STOCK                                           DEFICIT
                                              ------------------------------                               ACCUMULATED     TOTAL
                                                               AMOUNT           ADDITIONAL                 DURING THE  STOCKHOLDERS'
                                               NUMBER OF  ------------------     PAID-IN    SUBSCRIPTION   DEVELOPMENT    EQUITY
                                                SHARES    PER SHARE   TOTAL      CAPITAL     RECEIVABLE       STAGE      (DEFICIT)
                                              ----------  ---------  -------    ----------  ------------   ----------- -------------
<S>                                          <C>          <C>        <C>        <C>         <C>            <C>            <C>
                    (Continued) A75

Issuance of common stock for cash - October
through November 1996                             80,880     1.00        81        80,799            --             --       80,880
Issuance of common stock for cash - December
1996                                              14,545     0.69        15         9,985            --             --       10,000
Issuance of common stock for cash - January
1997                                              60,000     0.67        60        39,940            --             --       40,000
Issuance of common stock for cash - February
1997                                               4,444     0.56         4         2,496            --             --        2,500
Issuance of common stock for cash - March
through April 1997                               368,000     0.50       368       183,632            --             --      184,000
Issuance of common stock for cash - June
1997                                               8,064     0.31         8         2,492            --             --        2,500
Issuance of common stock for cash - July
through August 1997                              186,800     0.25       187        46,513            --             --       46,700
Issuance of common stock for services -
September 1997                                   274,299     0.20       274        54,586            --             --       54,860
Cancellation of shares - June 1997              (542,138)      --      (542)     (674,458)      675,000              -           --
Net loss                                              --       --        --            --            --       (858,915)    (858,915)
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
BALANCE,  SEPTEMBER 30, 1997                  24,054,590       --    24,055     5,028,702    (1,656,800)    (2,697,432)     698,525
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
Issuance of common stock for cash - April
through September 1998                         2,810,000     0.10     2,810       278,190            --             --      281,000
Issuance of common stock for services -
September 1998                                   895,455     0.10       895        88,651            --             --       89,546
Issuance of common stock for compensation -
September 1998                                 2,200,000     0.10     2,200       217,800                           --      220,000
Cancellation of shares - September 1998       (2,538,170)      --    (2,538)   (1,534,262)    1,656,800             --      120,000
Net loss                                              --       --        --            --            --     (1,898,376)  (1,898,376)
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
BALANCE, SEPTEMBER 30, 1998                   27,421,875       --    27,422     4,079,081            --     (4,595,808)    (489,305)
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
</TABLE>

                                                                     (Continued)

   THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS.



<PAGE>   10

                               SIONIX CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
            STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) -- RESTATED
           FROM INCEPTION (OCTOBER 3, 1994) THROUGH SEPTEMBER 30, 2000

<TABLE>
<CAPTION>
                                                      COMMON STOCK                                           DEFICIT
                                              ------------------------------                               ACCUMULATED     TOTAL
                                                               AMOUNT           ADDITIONAL                 DURING THE  STOCKHOLDERS'
                                               NUMBER OF  ------------------     PAID-IN    SUBSCRIPTION   DEVELOPMENT    EQUITY
                                                SHARES    PER SHARE   TOTAL      CAPITAL     RECEIVABLE       STAGE      (DEFICIT)
                                              ----------  ---------  -------    ----------  ------------   ----------- -------------
<S>                                          <C>          <C>        <C>        <C>         <C>            <C>            <C>
                         (Continued)

Common stock issued for compensation -
RESTATED - January 1999                        3,847,742     0.10     3,847       389,078            --             --      392,925
Issuance of common stock for services
- July 1999                                       42,138     1.25        42        52,420            --             --       52,462
Issuance of common stock for services
- August 1999                                     17,500     0.38        18         6,545            --             --        6,563
Issuance of common stock for services
- September 1999                                 141,108     0.22       141        30,619            --             --       30,760
Issuance of common stock for services
- September 1999                                 505,000     0.25       505       125,745            --             --      126,250
Issuance of common stock for cash -
October 1998 through September 1999            9,383,000     0.10     9,383       928,917            --             --      938,300
Net loss - RESTATED                                   --       --        --            --            --     (1,158,755)  (1,158,755)
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
BALANCE, SEPTEMBER 30, 1999                   41,358,363       --    41,358     5,612,405            --     (5,754,563)    (100,800)
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
Issuance of common stock for cash -
October through December 1999                 10,303,500     0.10    10,304     1,020,046            --             --    1,030,350
Issuance of common stock for compen-
sation - December 1999                           355,142     0.15       355        52,916            --             --       53,271
Issuance of common stock for compensation
- March 2000                                     406,965     1.04       407       426,473            --             --      426,880
Issuance of common stock for compensation
- June 2000                                      376,674     1.18       377       444,098            --             --      444,475
Issuance of common stock for compensation
- September 2000                                 378,834     0.78       379       295,111            --             --      295,490
Issuance of common stock for services
- November 1999                                   25,000     0.10        25         2,475            --             --        2,500
Issuance of common stock for services
- December 1999                                  659,738     0.10       660        65,314            --             --       65,974
Issuance of common stock for services
- January 2000                                   108,436     0.30       108        32,904            --             --       33,012
Issuance of common stock for services -
March 2000                                         7,483     1.12         7         8,374            --             --        8,381
Issuance of common stock for services -
April 2000                                             7     1.71         1            11            --             --           12
Issuance of common stock for services -
June 2000                                         14,459     0.97        14        14,011            --             --       14,025
Issuance of common stock for services -
July 2000                                         16,026     0.89        16        13,804            --             --       13,820
Issuance of common stock for services
- July 2000                                        3,377     0.67         3         2,260            --             --        2,263
</TABLE>

                                                                     (Continued)

   THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS.



<PAGE>   11

                               SIONIX CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
            STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) -- RESTATED
           FROM INCEPTION (OCTOBER 3, 1994) THROUGH SEPTEMBER 30, 2000

<TABLE>
<CAPTION>
                                                      COMMON STOCK                                           DEFICIT
                                              ------------------------------                               ACCUMULATED     TOTAL
                                                               AMOUNT           ADDITIONAL                 DURING THE  STOCKHOLDERS'
                                               NUMBER OF  ------------------     PAID-IN    SUBSCRIPTION   DEVELOPMENT    EQUITY
                                                SHARES    PER SHARE   TOTAL      CAPITAL     RECEIVABLE       STAGE      (DEFICIT)
                                              ----------  ---------  -------    ----------  ------------   ----------- -------------
<S>                                          <C>          <C>        <C>        <C>         <C>            <C>            <C>
                         (Continued)

Issuance of common stock for  services
- July 2000                                       45,000     0.83        45        37,435            --             --       37,480
Issuance of common stock for  services
- August 2000                                      4,890     0.73         5         3,565            --             --        3,570
Issuance of common stock for  services
- August 2000                                    100,000     0.71       100        71,280            --             --       71,380
Issuance of common stock for  services
- September 2000                                   2,428     0.77         2         1,868            --             --        1,870
Net loss                                              --       --        --            --            --     (2,414,188)  (2,414,188)
                                              ----------    -----   -------    ----------   -----------    -----------  -----------
BALANCE, SEPTEMBER 30, 2000                   54,166,322    $  --    54,166    $8,104,350            --    $(8,168,751) $   (10,235)
                                              ==========    =====   =======    ==========   ===========    ===========  ===========
</TABLE>

   THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS.



<PAGE>   12

                               SIONIX CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 2000


1.   NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     Nature of operations

     Sionix Corporation (the "Company") was incorporated in Utah in 1985. The
     Company was formed to design, develop, and market an automatic water
     filtration system primarily for small water districts.

     The Company is in the development stage and its efforts have been
     principally devoted to research and development, organizational activities,
     and raising capital.

     Summary of significant accounting policies

     Cash equivalents

     Cash and cash equivalents represent cash and short-term highly liquid
     investments with original maturities of three months or less.

     Restricted cash

     Restricted cash represents a certificate of deposit which matures one year
     from the purchase date. The certificate of deposit is recorded at cost
     which approximates market. At September 30, 2000 the certificate of deposit
     was pledged as collateral under a compensating balance arrangement
     associated with a line of credit.

     Property and equipment

     Property and equipment are stated at cost. The cost of additions and
     improvements are capitalized while maintenance and repairs are expensed as
     incurred. Depreciation of property and equipment is provided on a
     straight-line basis over the estimated five year useful lives of the
     assets.

     Research and development

     Research and development costs are expensed as incurred.

     Patents

     Patents are stated at cost and are being amortized using the straight-line
     method over their estimated useful lives of 15 years.

<PAGE>   13

                               SIONIX CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 2000


1.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

     Provision for income taxes

     No provision for federal income taxes have been recorded due to net
     operating losses. The Company accounts for income taxes pursuant to FASB
     Statement No. 109. The Internal Revenue Code contains provisions which may
     limit the loss carryforwards available should certain events occur,
     including significant changes in stockholder ownership interests.

     Advertising

     The cost of advertising is expensed as incurred. Total advertising costs
     were $1,345 and $1,135 for the years ended September 30, 2000 and 1999,
     respectively.

     Stock based compensation

     The Company has adopted the disclosure provisions only of SFAS 123 and
     continues to account for employee based compensation using the intrinsic
     value method prescribed in accordance with the provisions of APB No. 25,
     Accounting for Stock Issued to Employees, and related interpretations.
     Common stock issued to employees for compensation is accounted for based on
     the market price of the underlying stock, generally the average low bid
     price.

     Common stock issued to non-employees in exchange for services is accounted
     for based on the fair value of the services received.


     Basic and diluted net loss per share

     Net loss per share is calculated in accordance with Statement of Financial
     Accounting Standards 128, Earnings Per Share ("SFAS 128"). Basic net loss
     per share is based upon the weighted average number of common shares
     outstanding. Diluted net loss per share is based on the assumption that all
     dilutive convertible shares and stock options were converted or exercised.
     Dilution is computed by applying the treasury stock method. Under this
     method, options and warrants are assumed to be exercised at the beginning
     of the period (or at the time of issuance, if later), and as if funds
     obtained thereby were used to purchase common stock at the average market
     price during the period.


1.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED

     Fair value of financial instruments

<PAGE>   14

                               SIONIX CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 2000


     The carrying amounts of cash, notes payable and accounts payable
     approximate fair value due to the short-term maturities of these assets and
     liabilities. The fair value of marketable securities is based on quoted
     market prices.

     Estimates

     The preparation of financial statements in conformity with generally
     accepted accounting principles requires management to make estimates and
     assumptions that affect the reported

     Reclassifications

     Certain prior year amounts have been reclassified to conform to the fiscal
     2000 presentation.


2.   BASIC AND DILUTED LOSS PER SHARE

     The following table illustrates the reconciliation of the numerators and
     denominators of the basic and diluted loss per share computations. The
     table is restated to show the corrected number of shares outstanding. The
     previously reported loss per share was $.07 for 2000 and $.04 for 1999 The
     Company has no potentially dilutive securities, options, warrants or other
     rights outstanding.

<TABLE>
<CAPTION>
                                                    YEAR ENDED SEPTEMBER 30,
                                               ---------------------------------
                                                   2000                 1999
                                               ------------         ------------
                                                 RESTATED             RESTATED
                                               ------------         ------------
<S>                                            <C>                  <C>

     Numerator:
     Net loss                                  $ (2,414,188)        $ (1,158,755)
                                               ------------         ------------

     Denominator:
     Basic and diluted weighted average
     number of common shares
        outstanding during the period            49,861,728           36,260,775
                                               ------------         ------------

     Basic and diluted loss per share          $      (0.05)        $      (0.03)
                                               ============         ============
</TABLE>

3.   INTANGIBLES

     During fiscal 1998 The Company wrote-off obsolete intangibles of $1,040,865
     resulting from new managements decision not to pursue a product line
     relating to these intangibles.

<PAGE>   15

                               SIONIX CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 2000


     At September 30, 2000, patents were as follows:

          Patents issued and pending                        $ 135,033
          Less accumulated amortization                       (40,292)
                                                            ---------
                                                            $  94,741
                                                            =========

     Amortization expense for fiscal 2000 and 1999 was $9,001 and $9,002,
     respectively.


4.   PROPERTY AND EQUIPMENT

          Equipment                                         $ 155,125
          Furniture and fixtures                               20,240
                                                            ---------
                                                              175,365
                   Less accumulated depreciation             (140,801)
                                                            ---------
                                                            $  34,564
                                                            =========

     Depreciation expense for fiscal 2000 and 1999 was $42,846 and $40,093,
     respectively.


5.   NOTES PAYABLE

     Pursuant to a 1992 acquisition agreement, the Company assumed unsecured
     promissory notes totaling $50,000 at 8%, which became past due in 1994.
     Accordingly, the notes are classified as due on demand; accrued and unpaid
     interest is $32,313 at September 30, 2000.


6.   NOTES PAYABLE - RELATED PARTIES

     The Company has received advances in the form of unsecured promissory notes
     from stockholders and other related parties in order to pay ongoing
     operating expenses. These notes are at interest rates up to 13.5% and are
     due on demand. As of September 30, 2000, amounts due to related parties
     included $327,351 of principal and $83,901 of unpaid interest.

7.   LINE OF CREDIT

     On March 1, 2000, the Company obtained a $100,000 line of credit with a
     bank which matures on March 1, 2001. The line of credit bears interest at
     11.5% and is secured by a $100,000 certificate of deposit. At September 30,
     2000 no amounts were outstanding under this line.

<PAGE>   16

                               SIONIX CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 2000


8.   PRIOR PERIOD ADJUSTMENTS

     The Company's 1999 financial statements have been restated to correct
     errors as follows:

      (1) The failure to record common stock issued to employees for
          compensation and non-employees for services at fair value of $392,925.

      (2) The improper reporting of a $19,522 gain on the settlement of a
          building lease as extraordinary. The renegotiation of a building lease
          represents a recurring business activity.

      The effect of the correction of these errors is as follows:

<TABLE>
<CAPTION>
                                                     AS PREVIOUSLY            AS
          YEAR ENDED SEPTEMBER 30, 1999                 REPORTED           RESTATED
          -----------------------------              -------------        -----------
<S>                                                   <C>                 <C>

          STATEMENT OF SHAREHOLDERS' EQUITY
            Accumulated deficit:                      $(5,361,638)        $(5,754,563)
            Additional paid-in capital                $ 5,225,527         $ 5,612,405
            Common stock                              $    35,311         $    41,358
          STATEMENT OF OPERATIONS:
            General and administrative expense        $   699,316         $ 1,072,719
            (Gain) on settlement of debt              $   (19,522)        $        --
            Net loss                                  $  (765,830)        $(1,158,755)
</TABLE>

     In addition, the cumulative amounts reflected in the Statements of
     Operations include reclassifications to correct errors prior to fiscal 1999
     as follows:

     (1)  Improper recognition of revenue; the Company did not properly apply
          the guidance for revenue recognition under SOP 91-1. Therefore, net
          revenues totaling $8,960 were recorded in fiscal 1997 before
          culmination of the earning process.

     (2)  Inappropriate disclosure of the amortization of software of $53,614 in
          1997 as an unusual item. At the time the assets were capitalized,
          technological feasibility had not been established; therefore, these
          costs should have been reported as research and development.

<PAGE>   17

                               SIONIX CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 2000


8.   PRIOR PERIOD ADJUSTMENTS (CONTINUED)

     (3)  Incorrect disclosure of legal expense totaling $25,125 as an unusual
          settlement cost in the fiscal 1997 financial statements.

     The effect of these reclassifications is to increase research and
     development by $44,654 and general and administrative by $25,125 and
     eliminate the separate disclosure of these items as unusual.


9.   LEASES

     On August 6, 1998, the Company entered into a three-year noncancelable
     operating lease relating to its office facility expiring on August 30,
     2001. Rent expense totaled $41,098 and $42,386 during fiscal 2000 and 1999,
     respectively. Future minimum rental payment is $34,144 for fiscal 2001.


10.  INCOME TAXES

     The Company recognizes deferred tax assets and liabilities for temporary
     differences between the financial reporting and tax bases of its assets and
     liabilities. Deferred tax assets are reduced by a valuation allowance when
     deemed appropriate.

     At September 30, 2000, the Company has a net operating loss carryforward
     for federal tax purposes of $4,200,000 which, if unused to offset future
     taxable income, will expire beginning in 2008 through 2020.

     The Company has deferred tax assets of $ 1,680,000 at September 30, 2000
     relating to its net operating losses. The Company provided a 100% valuation
     allowance for these deferred tax assets. The Company recorded no benefit
     for income taxes during the periods presented. During the periods ended
     September 30, 2000 and 1999, the Company's total valuation allowance
     increased approximately $218,000 and $1,293,000, respectively.


11.  STOCKHOLDERS' EQUITY

     The Company issued 22,496,500 shares of its common stock for cash in
     connection with a private placement during fiscal years 1998 through 2000
     at $.10 per share.

     The Company issued shares of its common stock in exchange for compensation
     under the terms of certain employment contracts. The employment contracts
     expire between November 30, 2000 and September 30, 2003 and call for
     quarterly issuances of common stock to four employees.

<PAGE>   18

                               SIONIX CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 2000



11.  STOCKHOLDERS' EQUITY (CONTINUED)

     On August 14, 2000 the Company entered into an agreement with a firm (the
     "Firm") to obtain investment capital. Under the terms of the agreement, the
     company employed the services of the Firm to obtain investment capital of
     no less than $1,000,000 for the acquisition, restructuring, marketing and
     procurement of new management relating to a water bottling and distribution
     venture. During fiscal 2000, the Firm received cash of $2,500 and 100,000
     shares of the Company's restricted common stock upon execution of the
     agreement. The shares of common stock issued were recorded at fair value
     (low bid price). At September 30, 2000 no investment capital has been
     raised under the terms of the agreement.


12.  LEGAL PROCEEDINGS

     In February 1999 the Company filed an action against its former President,
     Dascore, LLC, an entity controlled by the former President and in a
     business related to that of the Company; and a former officer and director
     of the Company (the "Defendants"). The Company alleges, that the Defendants
     have (1) infringed on certain patents owned by the Company, through
     knowledge gained in their former positions; (2) sold or attempted to sell
     technology owned by the Company and covered by patents; (3) conspired to
     convert technology, money and equipment owned by the Company to pay
     personal expenses, and (4) defrauded the Company and breached their
     fiduciary duties in connection with their departure by retention of
     property owned by the Company.

     In June 1999, the United States District Court had issued a preliminary
     injunction enjoining the Defendants from selling or transferring shares of
     the Company's stock in excess of 10,000,000 shares. The Defendants have
     twice sought to have that injunction dissolved and both attempts were
     unsuccessful. The Defendants have filed a cross-complaint against the
     Company based on a breach of contract cause of action and to collect loans
     allegedly made by them to the Company. The case is currently in the
     discovery stage.

     The Company has filed an action for professional negligence, malpractice,
     breach of fiduciary duty and breach of contract against its previous patent
     counsel and a separate action against its previous corporate counsel. The
     action against the patent attorneys alleges that the patent attorneys
     represented the Company and its former President contemporaneously and
     failed to advise the corporation of the inherent conflict of interest in
     representing both parties. The action further alleges the patent attorneys
     aided the former President and others in misappropriating the Company's
     intellectual property and trade secrets. The action seeks monetary damages,
     attorneys fees and interest. The action against the former corporate
     counsel seeks damages arising out of the alleged creation of

<PAGE>   19

                               SIONIX CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 2000


12.  LEGAL PROCEEDINGS (CONTINUED)

     false documents to defraud the Company with respect to certain intellectual
     property rights and securities transactions. Both actions are in the
     discovery stage.

     The Company is the defendant in an action, Barnett v. Sionix Corporation,
     pending in Orange County Superior Court The complaint seeks repayment of
     approximately $150,000 in alleged loans. The plaintiff is the mother-in-law
     of the former Chief Executive Officer of the Company. The Company has
     cross-complained against the plaintiff and the former Chief Executive
     Officer for breach of fiduciary duty relating to the alleged loans.

     Management believes that the ultimate liabilities resulting from such
     lawsuits and claims if any, will not materially affect the results,
     liquidity or financial position of the Company.


13.  SUBSEQUENT EVENTS

     In October 2000, the Company and the Environmental Products Division of
     Hoffinger Industries, Inc. ("EPD") entered into a Joint Venture Agreement
     to form Sionix/EDP (the "Joint Venture"), a limited liability corporation,
     to develop, market, sell and manufacture water filtration technology
     products. Pursuant to the terms of the Joint Venture Agreement, the
     Company's initial contribution consisted of cash of $12,500 and licensing
     of its intellectual property in exchange for 51% of all shares of the Joint
     Venture. EDP's initial contribution included cash of $12,500 and services
     consisting of manufacturing, assembly, advertising and marketing in
     exchange for 49% of all shares of the Joint Venture. Any capital
     contributions beyond the initial contributions are borne equally by the
     Company and EDP. Net profits and losses of the Joint Venture are allocated
     based on the ownership interests. The Company's consolidated financial
     statements will include the accounts of the Joint Venture as a result of
     the Company's controlling interest. The Board of Directors consists of five
     directors comprising two members appointed by the Company and two members
     appointed by EDP. The Company's President has been appointed as the
     Chairman of the Board of Directors The Joint Venture will automatically
     dissolve two years from the date of incorporation, unless otherwise
     directed by resolution of the Board of Directors and a concurring vote of
     the stockholders. Upon dissolution of the Joint Venture, all assets,
     property and intellectual rights shall become the sole and exclusive
     property of the Company. EDP will retain the right to obtain a
     non-exclusive written license to distribute and sell Joint Venture products
     at a 10% discount.

14.  GOING CONCERN

     The accompanying financial statements have been prepared assuming that the
     Company will continue as a going concern. This basis of accounting
     contemplates the recovery of the Company's assets and the satisfaction of
     its liabilities in the normal course of business. Through September 30,
     2000, the Company had incurred cumulative losses of $8,168,751. The
     Company's successful transition from a development stage company to
     attaining profitable operations is dependent upon obtaining financing
     adequate to fulfill its research and development activities, production of
     its equipment and achieving a level of revenues adequate to support the
     Company's cost structure. Management's plan of operations anticipates that
     the cash requirements for the next twelve months will be met by obtaining
     capital contributions through the sale of common stock and cash flow from
     operations. However, there is no assurance that the Company will be able to
     implement its plan.

<PAGE>   20

                               SIONIX CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                          NOTES TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 2000


                                   SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Company has duly caused this Form 10-KSB/A to be
signed on its behalf by the undersigned, thereunto duly authorized.

                                              Sionix Corporation
Date: June 13, 2001
                                              By: /s/ JAMES J. HOUTZ
                                                  ------------------------------
                                                      James J. Houtz, President


     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Amendment to Annual Report has been signed below by the following persons on
behalf of the Company and in the capacities and on the date indicated.

<TABLE>
<CAPTION>
Signature                                                    Title                     Date
---------                                                    -----                     ----
<S>                                                          <C>                   <C>

(1)  Principal Executive Officer


/s/ JAMES J. HOUTZ                                     President and a             June 13, 2001
------------------------------------------                 Director
    James J. Houtz

(2)  Principal Financial and Accounting Officer


/s/ ROBERT E. MCCRAY                                Chief Financial Officer        June 13, 2001
------------------------------------------              and a Director
    Robert E. McCray

(3)  Directors


/s/ JOAN C. HOROWITZ                              Secretary/Treasurer and a        June 13, 2001
------------------------------------------                 Director
    Joan C. Horowitz


                                                           Director                June   , 2001
------------------------------------------
    Rodney Anderson
</TABLE>