Document:

AMERICAN INDUSTRIAL REAL ESTATE ASSOCIATION
                                STANDARD SUBLEASE
                 (Long-form to be used with pre-1996 AIR leases)

     1. PARTIES. This Sublease, dated, for reference purposes only, January 19,
1999 is made by and between Millipore Corporation ("Sublessor") and Spectrum
Laboratories, Inc. ("Sublessee").
     2. PREMISES. Sublessor hereby subleases to Sublessee and Sublessee hereby
subleases from Sublessor for the term, at the rental, and upon all of the
conditions set forth herein, that certain real property, including all
improvements therein, and commonly known by the street address of 18617
Broadwick, Rancho Domiguez located in the County of Los Angeles, State of
California and generally described as (describe briefly the nature of the
property) a +/-55,500 square foot concrete tilt-up industrial building commonly
known as 18617 Broadwick shown on Exhibit "A" attached hereto

("PREMISES").
     3.  TERM.
         3.1 TERM. The term of this Sublease shall be for six (6) years five and
one/half (5 1/2) months commencing on March 1, 1999 and ending on July 14, 2005
unless sooner terminated pursuant to any provision hereof.
         3.2 DELAY IN COMMENCEMENT. Sublessor agrees to use its best
commercially reasonable efforts to deliver possession of the Premises by the
commencement date. If, despite said efforts, Sublessor is unable to deliver
possession as agreed, Sublessor shall not be subject to any liability therefor,
nor shall such failure affect the validity of this Sublease. Sublessee shall
not, however, be obligated to pay Rent or perform its other obligations until it
receives possession of the Premises. If possession is not delivered within sixty
days after the commencement date, Sublessee may, at its option, by notice in
writing within ten days after the end of such sixty day period, cancel this
Sublease, in which event the Parties shall be discharged from all obligations
hereunder. If such written notice is not received by Sublessor within said ten
day period, Sublessee's right to cancel shall terminate. Except as otherwise
provided, if possession is not tendered to Sublessee when required and Sublessee
does not terminate this Sublease, as aforesaid, any period of rent abatement
that Sublessee would otherwise have enjoyed shall run from the date of delivery
of possession and continue for a period equal to what Sublessee would otherwise
have enjoyed under the terms hereof, but minus any days of delay caused by the
acts or omissions of Sublessee. If possession is not delivered within 120 days
after the commencement date, this Sublease shall automatically terminate unless
the Parties agree, in writing, to the contrary.
     4. RENT.
         4.1 BASE RENT. Sublessee shall pay to Sublessor as Base Rent for the
Premises equal monthly payments as stated in Paragraph 4.1 of the Addendum in
advance, on the First (1st) day of each month of the term hereof. Sublessee
shall pay Sublessor upon the execution hereof $13,875 as Base Rent for March,
1999

Base Rent for any period during the term hereof which is for less than one month
shall be a pro rata portion of the monthly installment.

         4.2 RENT DEFINED. All monetary obligations of Sublessee to Sublessor
under the terms of this Sublease (except for the Security Deposit) are deemed to
be rent ("RENT"). Rent shall be payable in lawful money of the United States to
Sublessor at the address stated herein or to such other persons or at such other
places as Sublessor may designate In writing.

     5. SECURITY DEPOSIT. Sublessee shall deposit with Sublessor upon execution
hereof $ 27 ,750 as security for Sublessee's faithful performance of Sublessee's
obligations hereunder. If Sublessee fails to pay Rent or other charges due
hereunder, or otherwise defaults with respect to any provision of this Sublease,
Sublessor may use, apply or retain all or any portion of said deposit for the
payment of any Rent or other charge in default or for the payment of any other
sum to which Sublessor may become obligated by reason of Sublessee's default, or
to compensate Sublessor for any loss or damage which Sublessor may suffer
thereby. If Sublessor so uses or applies all or any portion of said deposit,
Sublessee shall within ten days after written demand therefore forward to
Sublessor an amount sufficient to restore said Deposit to the full amount
provided for herein and Sublessee's failure to do so shall be a material breach
of this Sublease. Sublessor shall not be required to keep said Deposit separate
from its general accounts. If Sublessee performs all of Sublessee's obligations
hereunder, said Deposit, or so much thereof as has not therefore been applied by
Sublessor, shall be returned, without payment of interest to Sublessee (or at
Sublessor's option, to the last assignee, if any, of Sublessee's interest
hereunder) at the expiration of the term hereof, and after Sublessee has vacated
the Premises. No trust relationship is created herein between Sublessor and
Sublessee with respect to said Security Deposit.

     6. USE.
         6.1 AGREED USE. The Premises shall be used and occupied only for
general offices, warehouse, manufacturing and distribution of hospital products
and for no other purpose.
         6.2 ACCEPTANCE OF PREMISES AND LESSEE. Sublessee acknowledges that:
         (a) it has been advised by Brokers to satisfy itself with respect to
the condition of the Premises (including but not limited to the electrical, HVAC
and fire sprinkler systems, security, environmental aspects, and compliance with
Applicable Requirements), and their suitability for Sublessee's intended use,
         (b) Sublessee has made such investigation as it deems necessary with
reference to such matters and assumes all responsibility therefor as the same
relate to its occupancy of the Premises, and
         (c) neither Sublessor, Sublessor's agents, nor any Broker has made any
oral or written representations or warranties with respect to said matters other
than as set forth in this Sublease.
In addition, sublessor acknowledges that:

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1997-American Industrial Real Estate Association
                                     REVISED                    FORM SBL-1-3/97E

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         (a) Broker has made no representations, promises or warranties
concerning Sublessee's ability to honor the Sublease or suitability' to occupy
the Premises, and
         (b) it is Sublessor's sole responsibility to investigate the financial
capability and/or suitability of all proposed tenants.
     7. MASTER LEASE
         7.1 Sublessor is the lessee of the Premises by virtue of a lease,
hereinafter the "Master Lease", a copy of which is attached hereto marked
Exhibit 1, wherein The Carson Companies is the lessor, hereinafter the "MASTER
LESSOR".
         7.2 This Sublease is and shall be at all times subject and subordinate
to the Master Lease.
         7.3 The terms, conditions and respective obligations of Sublessor and
Sublessee to each other under this Sublease shall be the terms and conditions of
the Master Lease except for those provisions of the Master Lease which are
directly contradicted by this Sublease in which event the terms of this Sublease
document shall control over the Master Lease. Therefore, for the purposes of
this Sublease, wherever in the Master Lease the word "Lessor" is used it shall
be deemed to mean the Sublessor herein and wherever in the Master Lease the word
"Lessee" is used it shall be deemed to mean the Sublessee herein.
         7.4 During the term of this Sublease and for all periods subsequent for
obligations which have arisen prior to the termination of this Sublease,
Sublessee does hereby expressly assume and agree to perform and comply with, for
the benefit of Sublessor and Master Lessor, each and every obligation of
Sublessor under the Master Lease except for the following paragraphs which are
excluded therefrom:
    None

         7.5 The obligations that Sublessee has assumed under paragraph 7.4
hereof are hereinafter referred to as the "SUBLESSEE'S ASSUMED OBLIGATIONS". The
obligations that Sublessee has not assumed under paragraph 7.4 hereof are
hereinafter referred to as the "SUBLESSOR'S REMAINING OBLIGATIONS".
         7.6 Sublessee shall hold Sublessor free and harmless from all
liability, judgments, costs, damages, claims or demands, including reasonable
attorneys fees, arising out of Sublessee's failure to comply with or perform
Sublessee's Assumed Obligations.
         7.7 Sublessor agrees to maintain the Master Lease during the entire
term of this Sublease, subject, however, to any earlier termination of the
Master Lease without the fault of the Sublessor, and to comply with or perform
Sublessor's Remaining Obligations and to hold Sublessee free and harmless from
all liability, judgments, costs, damages, claims or demands arising out of
Sublessor's failure to comply with or perform Sublessor's Remaining Obligations.
         7.8 Sublessor represents to Sublessee that the Master Lease is in full
force and effect and that to Sublessor's actual knowledge no default exists on
the part of any Party to the Master Lease.
     8. ASSIGNMENT OF SUBLEASE AND DEFAULT.
         8.1 Sublessor hereby assigns and transfers to Master Lessor the
Sublessor's interest in this Sublease, subject however to the provisions of
Paragraph 8.2 hereof.
         8.2 Master Lessor, by executing this document, agrees that until a
Default shall occur in the performance of Sublessor's Obligations under the
Master Lease, that Sublessor may receive, collect and enjoy the Rent accruing
under this Sublease. However, if Sublessor shall Default in the performance of
its obligations to Master Lessor then Master Lessor may, at its option, receive
and collect, directly from Sublessee, all Rent owing and to be owed under this
Sublease. Master Lessor shall not, by reason of this assignment of the Sublease
nor by reason of the collection of the Rent from the Sublessee, be deemed liable
to Sublessee for any failure of the Sublessor to perform and comply with
Sublessor's Remaining Obligations.
         8.3 Sublessor hereby irrevocably authorizes and directs Sublessee upon
receipt of any written notice from the Master Lessor stating that a Default
exists in the performance of Sublessor's obligations under the Master Lease, to
pay to Master Lessor the Rent due and to become due under the Sublease.
Sublessor agrees that Sublessee shall have the right to rely upon any such
statement and request from Master Lessor, and that Sublessee shall pay such Rent
to Master Lessor without any obligation or right to inquire as to whether such
Default exists and notwithstanding any notice from or claim from Sublessor to
the contrary and Sublessor shall have no right or claim against Sublessee for
any such Rent so paid by Sublessee.
         8.4 No changes or modifications shall be made to this Sublease without
the consent of Master Lessor.

     9. CONSENT OF MASTER LESSOR.
         9.1 In the event that the Master Lease requires that Sublessor obtain
the consent of Master Lessor to any subletting by Sublessor then, this Sublease
shall not be effective unless, within ten days of the date hereof. Master Lessor
signs this Sublease thereby giving its consent to this Subletting.
         9.2 In the event that the obligations of the Sublessor under the Master
Lease have been guaranteed by third parties then neither this Sublease, nor the
Master Lessor's consent, shall be effective unless, within 10 days of the date
hereof, said guarantors sign this Sublease thereby giving their consent to this
Sublease.
         9.3 In the event that Master Lessor does give such consent then:
               (a)Such consent shall not release Sublessor of its obligations or
alter the primary liability of Sublessor to pay the Rent and perform and comply
with all of the obligations of Sublessor to be performed under the Master Lease.
               (b) The acceptance of Rent by Master Lessor from Sublessee or
anyone else liable under the Master Lease shall not be deemed a waiver by Master
Lessor of any provisions of the Master Lease.
               (c) The consent to this Sublease shall not constitute a consent
to any subsequent subletting or assignment.
               (d) In the event of any Default of Sublessor under the Master
Lease, Master Lessor may proceed directly against any Sublessor, guarantors or
anyone else liable under the Master Lease or this Sublease without first
exhausting Master Lessor's remedies against any other person or entity liable
thereon to Master Lessor.
               (e) CROSSED OUT AND DELETED
               (f) In the event that Sublessor shall Default in its obligations
under the Master Lease, then Master Lessor, at its option and without being
obligated to do so, may require Sublessee to attorn to Master Lessor in which
event Master Lessor shall undertake the obligations of Sublessor under this
Sublease from the time of the exercise of said option to termination of this
Sublease but Master Lessor shall not be liable for any prepaid Rent nor any
Security Deposit paid by Sublessee, nor shall Master Lessor be liable for any
other Defaults of the Sublessor under the Sublease.
         9.4 The signatures of the Master Lessor and any Guarantors of
Sublessor at the end of this document shall constitute their consent to the
terms of this Sublease.

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                                     REVISED                    FORM SBL-1-3/97E

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         9.5 Master Lessor acknowledges that, to the best of Master Lessor's
knowledge, no Default presently exists under the Master Lease of obligations to
be performed by Sublessor and that the Master Lease is in full force and effect.
         9.6 In the event that Sublessor Defaults under its obligations to be
performed under the Master Lease by Sublessor, Master Lessor agrees to deliver
to Sublessee a copy of any such notice of default. Sublessee shall have the
right to cure any Default of Sublessor described in any notice of default within
ten days after service of such notice of default on Sublessee. If such Default
is cured by Sublessee then Sublessee shall have the right of reimbursement and
offset from and against Sublessor.
     10. BROKERS FEE.
         10.1 Upon execution hereof by all parties, Sublessor shall pay to CB
Richard Ellis Per Separate Agreement a licensed real estate broker, ("BROKER"),
a fee as set forth In a separate agreement between Sublessor and Broker, or in
the event there is no such separate agreement, the sum of $_____________for
brokerage services rendered by Broker to Sublessor in this transaction.
     10.2 CROSSED OUT AND DELETED
     10.3 CROSSED OUT AND DELETED
     10.4 CROSSED OUT AND DELETED
     10.5 Any transferee of Sublessor's interest in this Sublease, or of Master
Lessor's interest in the Master Lease, by accepting an assignment thereof, shall
be deemed to have assumed the respective obligations of Sublessor or Master
Lessor under this Paragraph 10.
Broker shall be deemed to be a third-party beneficiary of this paragraph 10.
     11. ATTORNEY'S FEES. If any party or the Broker named herein brings an
action to enforce the terms hereof or to declare rights hereunder, the
prevailing party in any such action, on trial and appeal, shall be entitled to
his reasonable attorney's fees to be paid by the losing party as fixed by the
Court.
     12. ADDITIONAL PROVISIONS. If there are no additional provisions, draw a
line from this point to the next printed word after the space left here. If
there are additional provisions place the same here.
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                                   Page 3 of 4
1997-American Industrial Real Estate Association
                                      REVISED                   FORM SBL-1-3/97E

<PAGE>

ATTENTION: NO REPRESENTATION OR RECOMMENDATION IS MADE BY THE AMERICAN
INDUSTRIAL REAL ESTATE ASSOCIATION OR BY ANY REAL ESTATE BROKER AS TO THE LEGAL
SUFFICIENCY, LEGAL EFFECT. OR TAX CONSEQUENCES OF THIS SUBLEASE OR THE
TRANSACTION TO WHICH IT RELATES. THE PARTIES ARE URGED TO:

1. SEEK ADVICE OF COUNSEL AS TO THE LEGAL AND TAX CONSEQUENCES OF THIS SUBLEASE.

2 RETAIN APPROPRIATE CONSULTANTS TO REVIEW AND INVESTIGATE THE CONDITION OF THE
PREMISES. SAID INVESTIGATION SHOULD INCLUDE BUT NOT BE LIMITED TO: THE POSSIBLE
PRESENCE OF HAZARDOUS SUBSTANCES, THE ZONING OF THE PROPERTY, THE STRUCTURAL
INTEGRITY, THE CONDITION OF THE ROOF AND OPERATING SYSTEMS, AND THE SUITABILITY
OF THE PREMISES FOR SUBLESSEE'S INTENDED USE.

WARNING: IF THE SUBJECT PROPERTY IS LOCATED IN A STATE OTHER THAN CALIFORNIA,
CERTAIN PROVISIONS OF THE SUBLEASE MAY NEED TO BE REVISED TO COMPLY WITH THE
LAWS OF THE STATE IN WHICH THE PROPERTY IS LOCATED.

Executed at: Bedford, MA                    Millipore Corporation

on: February 2, 1999                        By: /s/ Edward Lang    /s/ MSL

Address: 80 Ashby Road                      By Ed Lang, Corporate Vice-President
                                            "Sublessor' (Corporate Seal)

Executed at: Los Angeles                    Spectrum Laboratories, Inc.

on: Jan 29, 1999                            By: /s/ signature

Address: 18617 Broadwick, 90220             By: CEO
                                            "Sublessee" (Corporate Seal)

Executed at:

on:                                         By

Address:                                    By

                                            "Master Lessor" (Corporate Seal)

NOTE: These forms are often modified to meet changing requirements of law and
needs of the Industry. Always write or call to make sure you are utilizing the
most current form: AMERICAN INDUSTRIAL REAL ESTATE ASSOCIATION, 700 So. Flower
St., Suite 600, Los Angeles, CA 90017. (213) 687-8777.

                                   Page 4 of 4
1997-American Industrial Real Estate Association
                                     REVISED                    FORM SBL-1-3/97E

<PAGE>

ADDENDUM FOR THE SUBLEASE DATED JANUARY 19, 1999 BY AND BETWEEN MILLIPORE
CORPORATION AS "SUBLESSOR" AND SPECTRUM LABORATORIES, INC. AS "SUBLESSEE" FOR
THE PROPERTY LOCATED AT 18617 BROADWICK, RANCHO DOMINGUEZ, CALIFORNIA
--------------------------------------------------------------------------------

4.1      BASE RENT:
         The Base Rent shall be Thirteen Thousand Eight Hundred Seventy-Five
         Thousand Dollars ($13,875.00) triple net for the first six (6) months
         and thereafter adjusted to Twenty-Two Thousand Two Hundred Dollars
         ($22,200.00) triple net per month plus rent adjustment per Lease
         Addendum. In addition and without limitation, Sublessee shall pay for
         all property taxes, property insurance, property maintenance, and
         utilities of the subject Premises.

 13.     CONDITION OF PREMISES:
         Sublessor shall deliver the Premises to Sublessee in "as is" condition.

AGREED AND ACCEPTED

MILLIPORE CORPORATION                         SPECTRUM LABORATORIES, INC.

By: /s/ Edward Lang   MSL                     By:  /s/ signature

Date:                                         Date: Jan 29, 1999

<PAGE>

                               RENT ADJUSTMENT(S)
                             STANDARD LEASE ADDENDUM

             Dated     January 19, 1999

             By and Between (SUBLessor) Millipore Corporation

                            (SUBLessee) Spectrum Laboratories, Inc.

             ADDRESS OF PREMISES:18617 Broadwick, Rancho Dominguez, CA

Paragraph _______

 A.  RENT ADJUSTMENTS:

     The monthly rent for each month of the adjustment period(s) specified below
shall be increased using the method(s) indicated below (Check Method(s) to be
Used and Fill in Appropriately)

 [x] I. Cost of Living Adjustment(s) (COLA)

         a.  On (Fill in COLA Dates):September 1, 2001 and  March 1, 2004

the Base Rent shall be adjusted by the change, If any, from the Base Month
specified below, in the Consumer Price Index of the Bureau of Labor Statistics
of the U.S. Department of Labor for (select one): [x] CPI W (Urban Wage Earners
and Clerical Workers) or [ ] CPI U (All Urban Consumers), for (Fill In Urban
Area): Los Angeles, Anaheim, and Riverside, All items (1982-1984=100), herein
referred to as "CPI". The increase shall be based upon a minimum of three
percent (3%) per annum and a maximum of seven percent (7%) per annum, cumulative
and noncompounded.

         b. The monthly rent payable in accordance with paragraph A.l.a. of this
Addendum shall be calculated as follows: the Base Rent set forth in paragraph
1.5 of the attached Lease, shall be multiplied by a fraction the numerator of
which shall be the CPI of the calendar month two months prior to the month(s)
specified in paragraph A.l.a. above during which the adjustment is to take
effect, and the denominator of which shall be the CPI of the calendar month
which is two months prior to (select one): [x] the first month of the term of
this Lease as set forth in paragraph 1.3 ("Base Month") or [ ] (Fill In Other
"Base Month"): _______________ ____________________________ The sum, so
calculated shall constitute the new monthly rent hereunder, but in no event,
shall any such new monthly rent be less than the rent payable for the month
immediately preceding the rent adjustment.

         c. In the event the compilation and/or publication of the CPI shall be
transferred to any other governmental department or bureau or agency or shall be
discontinued, then the index most nearly the same as the CPI shall be used to
make such calculation. In the event that the Parties cannot agree on such
alternative index, then the matter shall be submitted for decision to the
American Arbitration Association in accordance with the then rules of said
Association and the decision of the arbitrators shall be binding upon the
parties. The cost of said Arbitration shall be paid equally by the Parties.

II.  THIS SECTION IS CROSSED OUT AND DELETED

Initials  /s/                                                  Initials: /s/

                                RENT ADJUSTMENTS
                                  Page 1 of 2

<PAGE>

THE TOP PART OF THIS FORM IS CROSSED OUT AND DELETED

 B.  NOTICE:
     Unless specified otherwise herein, notice of any such adjustments, other
then Fixed Rental Adjustments, shall be made as specified in paragraph 23 of the
Lease.

 C. BROKER'S FEE:
    The Brokers specified in paragraph 1.10 shall be paid a Brokerage Fee for
    each adjustment specified above in accordance with paragraph 15 of the
    Lease.

Initials  /s/                                                    Initials: /s/

                                RENT ADJUSTMENTS
                                  Page 2 of 2Exhibit 10.21

                       FIRST AMENDMENT TO CREDIT AGREEMENT

          This First Amendment to Credit Agreement is entered into as of July
14, 1999, by and between Spectrum Laboratories, Inc., a Delaware corporation
("Borrower") and City National Bank, a national banking association ("CNB").

                                    RECITALS

          A. Borrower and CNB are parties to that certain Credit Agreement dated
as of December 22, 1998 (hereinafter the "Credit Agreement").

          B. Borrower and CNB desire to supplement and amend the Credit
Agreement as hereinafter set forth. NOW, THEREFORE, the parties agree as
follows:

1.            DEFINITIONS. Capitalized terms used in this Amendment without
              definition shall have the meanings set forth in the Credit
              Agreement.

2.            AMENDMENTS. The Credit Agreement is amended as follows:

              2.1       The following new definitions are added to Section 1 of
                        the Credit Agreement:

                        "CD COLLATERAL" means the time deposits owned by Roy
                        Eddleman and/or Borrower which are maintained at CNB and
                        pledged as collateral securing the Obligations.

                        "CD RATE" means the interest rate from time to time in
                        effect on the CD Collateral; provided, however, if there
                        is more than one rate, the CD Rate shall be the highest
                        of such rates.

                        "NET INCOME" shall be determined on a consolidated basis
                        for Borrower and the Subsidiaries and shall mean net
                        income after taxes determined in accordance with GAAP.

              2.2       The definition of "Cash/Securities Collateral" is
                        deleted from Section 1 of the Credit Agreement, and the
                        term CD Collateral will be substituted for the term
                        Cash/Securities Collateral everywhere else that the term
                        Cash/Securities Collateral appears in the Credit
                        Agreement.

              2.3       The definitions of "Cash Flow from Operations" and
                        "Tangible Net Worth" are amended in their entirety to
                        provide as follows:

                        "CASH FLOW FROM OPERATIONS" will be determined on a
                        consolidated basis for Borrower and the Subsidiaries and
                        means the sum of (a) net income after taxes and before
                        extraordinary items in accordance with GAAP earned over
                        the twelve month period ending on the date of
                        determination, PLUS (b) amortization of intangible
                        assets, PLUS (c) interest expense, PLUS (d) depreciation
                        expensed during the twelve month period ending on the
                        date of determination, PLUS the amount of "compensation
                        expense related to stock options" expensed during the
                        twelve-month period ending on the date of determination,
                        which expense is reflected as an increase in Borrower's
                        stockholders' equity, as shown on Borrower's financial
                        statements delivered to CNB pursuant to the terms of
                        this Agreement.

                                       1
<PAGE>

                        "TANGIBLE NET WORTH" means the total of all assets
                        appearing on a balance sheet prepared in accordance with
                        GAAP for Borrower and the Subsidiaries on a consolidated
                        basis, MINUS (a) all intangible assets, including,
                        without limitation, unamortized debt discount,
                        Affiliate, employee and officer receivables or advances,
                        goodwill, research and development costs, patents,
                        trademarks, the excess of purchase price over underlying
                        values of acquired companies, any covenants not to
                        compete, deferred charges (other than current prepaid
                        expenses and deferred taxes), copyrights, franchises,
                        art works and appraisal surplus; MINUS (b) all
                        obligations which are required by GAAP to be reflected
                        as a liability on the consolidated balance sheet of
                        Borrower and the Subsidiaries; MINUS (c) the amount, if
                        any, at which shares of stock of a non-wholly owned
                        Subsidiary appear on the asset side of Borrower's
                        consolidated balance sheet, as determined in accordance
                        with GAAP; MINUS (d) minority interests; MINUS (e)
                        deferred income and reserves not otherwise reflected as
                        a liability on the consolidated balance sheet of
                        Borrower and the Subsidiaries; PLUS (f) CD Collateral.

              2.4       The first sentence of Section 2.1.1 is stricken and
                        replaced with the following:

                        "Effective on the later to occur of the date of the
                        First Amendment, or the date on which Roy T. Eddleman
                        opens at CNB one or more time deposits to evidence CD
                        Collateral in an amount not less than $843,000.00, the
                        Term Loan A will bear interest until due (whether at
                        stated maturity, by acceleration or otherwise) at a rate
                        equal to (a) the CD Rate plus one percent (1.0%) per
                        annum on that portion of the outstanding principal
                        amount of the Term Loan A equal to the principal amount
                        of the CD Collateral, and (b) nine and 14/100 percent
                        (9.14%) per annum on that portion of the outstanding
                        principal amount of the Term Loan A in excess of the
                        principal amount of the CD Collateral, subject to the
                        provisions in CNB's Yield Maintenance Agreement, a copy
                        of which is attached as Exhibit "C", the terms of which
                        shall only apply to a prepayment on the principal amount
                        in excess of the CD Collateral."

              2.5       Section 2.2 is stricken and replaced with the following:

                        2.2 THE TERM LOAN B. CNB agrees to make, upon Borrower's
                        request, a term loan ("Term Loan B") to Borrower in the
                        principal amount of Two Hundred Seventy Five Thousand
                        Four Hundred Sixty Five and 44/100 Dollars
                        ($275,465.44). The Term Loan B will be evidenced by a
                        promissory note ("Term Note") in the form attached
                        hereto as Exhibit "B". or as superseded in any amendment
                        to this Agreement.

                              2.2.1 INTEREST ON TERM LOAN B. The Term Loan B
                        will bear interest from disbursement until due (whether
                        at stated maturity, by acceleration or otherwise) at a
                        fluctuating rate equal to the Prime Rate plus
                        one-quarter of one percent (0.25%) per annum. Interest
                        will be payable monthly in arrears on the first day of
                        each month, starting on August 1, 1999, and on the date
                        the Term Loan B is paid in full.

                              2.2.2 PAYMENT OF TERM LOAN B. The principal amount
                        of the Term Loan B will be repaid by Borrower to CNB in
                        twelve (12)

                                       2
<PAGE>

                        consecutive monthly installments, consisting of eleven
                        (11) installments each in the amount of $8,530.00, and a
                        final installment in the amount of $181,635.44,
                        commencing on August 1, 1999, and continuing on the
                        first day of each month up to and including July 1,
                        2000, on which date all principal and accrued interest
                        will be due and payable in full.

              2.6       Section 2.7 is stricken and replaced with the following:

                        "2.7 CD COLLATERAL. Borrower agrees that the aggregate
                        principal amount of the CD Collateral shall at no time
                        be less than $943,000.00, of which $843,000.00 shall be
                        pledged by Roy T. Eddleman; provided, however, CNB
                        agrees to release (a) $250,000.00 of the principal
                        amount of the CD Collateral pledged by Roy T. Eddleman
                        ("Eddleman CD Collateral") if Borrower is in compliance
                        with Section 5.10 of this Agreement as determined by CNB
                        from Borrower's financial statements for its fiscal
                        quarter ending July 3, 1999 delivered to CNB pursuant to
                        the terms of this Agreement and no Event of Default
                        exists hereunder at the time of such release, and (b) an
                        additional $250,000.00 of the principal amount of the
                        Eddleman CD Collateral if Borrower is in compliance with
                        Section 5.10 of this Agreement as determined by CNB from
                        Borrower's financial statements for its fiscal quarter
                        ending October 3, 1999 delivered to CNB pursuant to the
                        terms of this Agreement and no Event of Default exists
                        hereunder at the time of such release. If concurrently
                        with CNB's release of the Eddleman CD Collateral as
                        provided in this Section 2.7, the principal amount of
                        the released CD Collateral is used to prepay the
                        principal amount of Term Loan A, the prepayment charge
                        set forth in CNB's Yield Maintenance Agreement shall not
                        apply to such prepaid principal amount."

              2.7       Section 5.10 is stricken and replaced with the
                        following:

                        "5.10 FINANCIAL TESTS. Borrower shall maintain:

                              5.10.1 Tangible Net Worth plus Subordinated Debt
                        plus SLI Acquisition Corp. Preferred Stock of not less
                        than $2,500,000.00;

                              5.10.2 A ratio of Total Senior Liabilities to
                        Tangible Net Worth plus Subordinated Debt of not more
                        than 2.5 to 1 at all times;

                              5.10.3 A ratio of Cash Flow from Operations to
                        Debt Service of not less than 1.25 to 1 during the
                        twelve months preceding the date of determination;

                              5.10.4 Net Income of not less than $400,000.00 for
                        Borrower's' fiscal year ending; and

                              5.10.5 Net Income of not less than $1.00 for each
                        of Borrower's fiscal quarters."

              2.8       Section 7.1.9 is stricken and replaced with the
                        following:

                        "7.1.9 Roy T. Eddleman fails to maintain verifiable
                        Liquid Assets including CD Collateral of at least
                        $1,500,000.00."

                                       3
<PAGE>

              2.9       Exhibit "B" currently attached to the Credit Agreement
                        is superseded and replaced with Exhibit "B" attached to
                        this Amendment.

3.            EXISTING AGREEMENT. Except as expressly amended herein, the Credit
              Agreement shall remain in full force and effect, and in all other
              respects is affirmed.

4.            CONDITIONS PRECEDENT. This Amendment shall become effective upon
              the fulfillment of all of the following conditions to CNB's
              satisfaction:

              4.1       CNB shall have received this Amendment duly executed by
                        Borrower and acknowledged by the Guarantors;

              4.2       CNB shall have received a new Term Loan B in the form
                        attached as Exhibit "B" to this Amendment, duly executed
                        by Borrower;

              4.3       Roy T. Eddleman has opened one or more time deposits at
                        CNB to evidence CD Collateral in an amount not less than
                        $843,000.00 and CNB shall have received a pledge
                        agreement, duly executed by Roy T. Eddleman, pursuant to
                        which Roy T. Eddleman will pledge to CNB as collateral
                        for the Obligations CD Collateral in the foregoing
                        amount; and

              4.4       All other documents and legal matters in connection with
                        the transactions described in the Agreement will be
                        satisfactory in form and substance to CNB

5.            COUNTERPARTS. This Amendment may be executed in any number of
              counterparts, and all such counterparts taken together shall be
              deemed to constitute one and the same instrument.

6.            GOVERNING LAW. This Amendment and the rights and obligations of
              the parties hereto shall be construed in accordance with, and
              governed by the laws of the State of California.

IN WITNESS WHEREOF, the parties have executed this Amendment as of the day and
year first above written.

"Borrower"                           Spectrum Laboratories, Inc., a
                                     Delaware corporation

                                     By: /s/ Roy T. Eddleman
                                        -------------------------------------
                                        Roy T. Eddleman, Chief Executive Officer

 "CNB"                               City National Bank, a national
                                     banking association

                                     By: /s/ Richard Fein
                                        ----------------------------------------
                                        Richard Fein, Vice President

[Consent of Guarantors continued on next page]

                                       4

<PAGE>

[Consent of Guarantors continued from prior page]

CONSENT OF GUARANTORS:

          The undersigned have previously guaranteed the indebtedness of
SPECTRUM LABORATORIES, INC. owed to CNB. The undersigned confirm that their
respective guaranties and the security given in connection therewith, if any,
shall continue in full force and effect and that each such guaranty shall be a
separate and distinct obligation and apply to the indebtedness arising from the
Credit Agreement as amended herein, subject to the overall limitation as to the
amount guaranteed.

/s/ Roy T. Eddleman
- -----------------------------
Roy T. Eddleman

Spectrum Europe B.V., a                  Hydro-med Products, Inc., a
Netherlands company                      Texas Corporation

By: /s/ Roy T. Eddleman                  By: /s/ Roy T. Eddleman
   -----------------------------            --------------------------------

Its: CEO                                 Its: CEO
   -----------------------------            --------------------------------

SLI Acquisition Corp., a                 Spectrum Molecular Separations, Inc., a
Delaware corporation                     Delaware corporation

By: /s/ Roy T. Eddleman                  By: /s/ Roy T. Eddleman
   -----------------------------            --------------------------------

Its:  CEO                                Its:  CEO
   -----------------------------            --------------------------------

                                       5
<PAGE>

                                   TERM NOTE B
                               (ANY INTEREST RATE)
$275,465.44                                                   Irvine, California
                                                                   July 14, 1999

          FOR VALUE RECEIVED, the undersigned, SPECTRUM LABORATORIES, INC., a
Delaware corporation ("Borrower"), promises to pay to the order of CITY NATIONAL
BANK, a national banking association ("CNB"), at its Office located at 9
Executive Circle, Irvine, California 92614 the principal amount of TWO HUNDRED
SEVENTY FIVE THOUSAND FOUR HUNDRED SIXTY FIVE AND 44/100 DOLLARS ($275,465.44),
plus interest on the unpaid principal balance, computed on the basis of a
360-day year, actual days elapsed, at the rates, times and in accordance with
the terms of that certain Credit Agreement between Borrower and CNB, dated as of
December 22, 1998, as may be amended from time to time (the "Credit Agreement").
Principal is payable in twelve (12) consecutive monthly installments, consisting
of eleven (11) installments each in the amount of $8,530.00, and a final
installment in the amount of $181,635.44. commencing August 1, 1999, and
continuing on the first day of each month up to and including July 1, 2000, on
which day the balance of principal and interest thereon unpaid shall become due
and payable. Capitalized terms not defined herein will have the meanings given
them in the Credit Agreement.

         If payment on this Note becomes due and payable on a non-business day,
the maturity thereof shall be extended to the next business day and, with
respect to payments of principal or interest thereon, shall be payable during
such extension at the then applicable rate. Upon the occurrence of one or more
of the Events of Default specified in the Credit Agreement, all amounts
remaining unpaid on this Term Note may become or be declared to be immediately
payable as provided in the Credit Agreement. without presentment, demand or
notice of dishonor, all of which are expressly waived. Borrower agrees to pay
all costs of collection of this Note and reasonable attorneys' fees (including
attorneys' fees allocable to CNB's in-house counsel) in connection therewith,
irrespective of whether suit is brought thereon.

         This is the Term Note B referred to in the Credit Agreement and is
entitled to the benefits thereof, and supersedes and replaces in its entirety
that certain Term Note B dated December 22, 1998 in the original principal sum
of $326,645.44 executed by Borrower in favor of CNB.

         Upon CNB's written notice to Borrower of the occurrence of an Event of
Default, the outstanding principal balance (and interest, to the extent
permitted by law) shall bear additional interest from the date of such notice at
the rate of Five Percent (5.0%) per annum higher than the interest rate as
determined and computed above, and continuing thereafter until the Event of
Default is cured.

         This Note shall be governed by the laws of the State of California. If
this Note is executed by more than one Borrower, all obligations are joint and
several.

`BORROWER"                         Spectrum Laboratories, Inc., a
                                   Delaware corporation

                                   By:  /s/ Roy T. Eddleman
                                        ----------------------------------------
                                        Roy T. Eddleman, Chief Executive Officer

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