Document:

LETTER OF INTENT

It is the intent of the parties to enter into the "Consent To Action Without A
meeting Of The Board Of Directors Of Rochem Environmental, Inc.", copy of which
is attached here whereby, interalia, Pall Corporation will return 8, 589, 714
shares of REI common stock to REI and REI agrees to terminate its Distributor
Agreement with Pall dated September 1, 1993, pending favorable vote by REI
shareholders.

Furthermore, William Palmer agrees to resign his position on the Board of REI
once this transaction is formalized.

Agreed to by Pall Corporation                   Agreed to by REI

Name: /s/ WILLIAM PALMER                        Name: /s/ ERICK J. NEUMAN
      -----------------------------                   --------------------------
      William Palmer                            Erick J. Neuman

Title: Vice President                           Title: President

Date: July 17, 2000                             Date: July 17, 2000
Attachment:  Exhibit A
<PAGE>
                                    EXHIBIT A

                     CONSENT TO ACTION WITHOUT A MEETING OF
                            THE BOARD OF DIRECTORS OF
                           ROCHEM ENVIRONMENTAL, INC.

      Pursuant to the Utah Revised Business Corporation Act ("URBCA"), which
authorizes the taking of action by unanimous written consent of the Directors
and the shareholders, without a meeting, the undersigned, constituting all of
the Directors and a majority of the shareholders ("Majority Shareholders") of
Rochem Environmental, Inc., a Utah corporation ("Company"), hereby acknowledge
the following statements and give their unanimous written consent and take the
following action:

      WHEREAS, the Board of Directors and the Majority Shareholders of the
Company believe it is in the best interest of the Company to declare its
distribution agreement with Pall Corporation terminated;

      WHEREAS, the Board of Directors and the Majority Shareholders believe it
is in the best interest of the Company to issue a promissory note for payment of
debts owed to Pall Corporation, for the principal sum of $480,136.67, with
principal accruing at a rate of 10% per annum, with interest payable on
September 30, 2000 and every three months thereafter, and which entire principal
shall be due on or before December 31, 2002;

      NOW, THEREFORE, BE IT RESOLVED, that the appropriate officers are hereby
authorized, instructed, and directed to enter into an agreement with Pall
Corporation wherein the Company and Pall Corporation agree to render the
Distribution Agreement dated September 1, 1993 by and between Separation
Technology Systems, Inc. and Rochem Separation Systems, of which the Company and
Pall Corporation are successors in interest, respectively, terminated and of no
force and effect, in exchange for Pall Corporation returning 8,589,714 shares of
Company common stock to the Company. Nothing contained herein this agreement
shall be construed to imply that REI cannot compete with Pall using alternative
technologies in any market.

      RESOLVED FURTHER, that the appropriate officers of the Company are
authorized, instructed and directed to enter into a promissory note at the terms
and conditions set forth above.

      RESOLVED FURTHER, that the appropriate officers of the Company be, and
each of them hereby is, empowered, directed and authorized to do and perform, or
cause to be done and performed, deliver, or cause to be made, executed, and
delivered, all such agreements, undertakings, documents, instruments or
certificates in the name and on behalf of the Company or otherwise as such
officers may deem necessary or appropriate in order to effectuate or carry out
fully the purpose and intent of each and all the foregoing resolutions.
<PAGE>
      IN WITNESS WHEREOF, the undersigned, being all of the members of the Board
of Directors and the Majority Shareholders of Rochem Environmental, Inc., a Utah
corporation, do hereby execute this consent effective the ____th day of July,
2000.

DIRECTORS:                                MAJORITY SHAREHOLDERS:
---------                                 ----------------------
                                          (constituting 65% of the outstanding
                                          shares)

_____________________________             _______________________________
                                          (_______ shares)

_____________________________             _______________________________
                                          (_______ shares)

_____________________________             _______________________________
                                          (_______ shares)

_____________________________             _______________________________
                                          (_______ shares)

_____________________________             _______________________________
                                          (_______ shares)EXHIBIT 10.29

                      FOURTH AMENDMENT TO SUBORDINATED NOTE

      This Fourth Amendment to Subordinated Note (the "Fourth Amendment"),
effective the first day of May, 2000, is to that certain Convertible
Subordinated Promissory Note (the "Subordinated Note") in the original principal
sum of SEVEN MILLION AND NO/100 DOLLARS ($7,000,000.00) dated on or about April
30, 1996, executed by LASERMEDICS, INC., a Texas corporation (the "Company") and
payable to MAXXIM MEDICAL, INC., a Delaware corporation (the "Holder").

                                R E C I T A L S

      WHEREAS, the Company executed and delivered the Subordinated Note to the
Holder;

      WHEREAS, the Subordinated Note is subject to the terms and conditions of
that certain Subordination Agreement between the Company, Comerica Bank-Texas, a
Texas banking association, and the Holder;

      WHEREAS, the Holder hereby warrants and represents that it is still the
owner and holder of the Subordinated Note;

      WHEREAS, the Holder and the Company have agreed to modify and amend the
Subordinated Note as hereinafter provided, and have obtained the consent of
Comerica Bank-Texas to such amendment, all in the manner hereinafter described.

      1.    AMENDMENT TO SUBORDINATED NOTE - INTEREST. Article II, Section 2.1
            entitled "Interest" and Article II, Section 2.3, entitled
            "Redemption", of the Subordinated Note is hereby modified and
            amended as follows:

            (a)   2.1 INTEREST - PAST DUE. All past due interest installments
                  and all interest installments which become due prior to May 1,
                  2000, are hereby deferred and shall not be payable until MAY
                  1, 2002.

            (b)   2.1 INTEREST - PAYABLE MAY 1, 2000, THROUGH NOVEMBER 1, 2001.
                  The interest installment which is due on May 1, 2000 and those
                  which become due through November 1, 2001 are hereby deferred
                  and shall not be due and payable until MAY 1, 2002.

      NOTWITHSTANDING THE FOREGOING, any interest installment deferred pursuant
to this Fourth Amendment shall be considered due and owing for purposes of
Section 4.1, thereby entitling the Holder to convert such deferred interest
installment into fully paid and nonassessable shares of Common Stock of the
Company, all in the manner provided for in Section 4.1 of the Subordinated Note.
In calculating the Conversion Price, the deferral of interest in the manner
provided in the Fourth Amendment shall not constitute an Event of Default. Once
converted, the deferred interest installment would be deemed paid.

      2.    AMENDMENT TO SUBORDINATED NOTE - REDEMPTION. Article II, Section 2.3
            entitled "Redemption", of the Subordinated Note is hereby modified
            and amended as follows:

<PAGE>
            (a)   2.3.2 MANDATORY REDEMPTION - PAST DUE. All past due principal
                  redemption payments and all mandatory principal redemptions
                  which become due prior to May 1, 2000, are hereby deferred and
                  shall not be due and payable until MAY 1, 2002.

            (b)   2.3.2 MANDATORY REDEMPTION - DUE MAY 1, 2000. The principal
                  redemption payments due May 1, 2000 and May 1, 2001 are hereby
                  deferred and shall not be due and payable until MAY 1, 2002.

            No penalty, default or additional interest shall be payable by the
            Company as a result of this Amendment.

      3.    RATIO TEST FOR DEFERRED INTEREST AND/OR DEFERRED REDEMPTION
            PAYMENTS. A new Section 2.5 is added to the Subordinated Note to
            read as follows:

            SECTION 2.5 RATIO TEST FOR DEFERRED INTEREST AND DEFERRED REDEMPTION
            PAYMENTS. At such time as the Company achieves, a Cash Flow Coverage
            ratio of 1.75 to 1.0 provided, that there then exist no default by
            the Company under its credit agreement with Comerica Bank-Texas, and
            further provided that the payment of any deferred interest or
            deferred redemption payment would not result in any default
            thereunder, the Borrower shall pay in cash any interest or
            redemption payment which was deferred pursuant to the terms of the
            Fourth Amendment (provided the same had not previously been
            Converted to stock) so long as the same is paid in a month when the
            Company has achieved a Cash Flow Coverage ratio of 1.75 to 1.0.

            For purposes hereof, "Cash Flow Coverage" means the sum of net
            income, plus depreciation, plus amortization and interest expense,
            divided by the sum of current maturities of long term debt, plus
            current maturities of capital leases, plus interest expense, plus
            non-finance capital expenditures, to be calculated on a rolling
            three (3) month basis.

      4.    ACCELERATION. Article II of the Subordinated Note is hereby amended
            by adding a new Section 2.6 thereto to read as follows:

            SECTION 2.6 ACCELERATION. In the event that the indebtedness owing
            by the Company to Comerica Bank-Texas is repaid in full prior to May
            1, 2002, all payments of interest and all mandatory principal
            redemptions payments deferred pursuant to the provisions of the
            First, Second and Third Amendment to Subordinated Note shall then be
            immediately due and payable in full.

      5.    RATIFICATION. Except as herein above amended, the Subordinated Note
            remains in full force and effect.

      6.    COUNTERPARTS. This Amendment may be executed in any number of
            counterparts, but all of which when taken together shall constitute
            one and the same instrument.

<PAGE>
      EXECUTED this 25TH day of May, 2000, but effective as of May 1, 2000.

                                    MAXXIM MEDICAL, INC.,
                                    a Delaware corporation

                                    By: /s/ MARK SELLERS
                                    Name:   MARK SELLERS
                                    Title:  VICE CHAIRMAN & CFO

                                    HENLEY HEALTHCARE, INC.
                                    a Texas corporation (formerly known as
                                    Lasermedics, Inc.)

                                    By: /s/ JAMES STURGEON
                                            James Sturgeon
                                            Director of Finance

Acknowledged and Agreed to
this 30TH day of JULY, 2000

COMERICA BANK-TEXAS,
a Texas Banking Association

By: /s/ ROBIN KAIN
        Robin Kain
        Vice President

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