Document:

<PRE>
                                                                 Exhibit 10.29

                                            April 28, 2000

Mr. John H. Schroeder
20 Byron Drive
Mt. Laurel, NJ  08054

Dear John,

      Supplementing the terms of your Employment Agreement with Sybron Chemicals
Inc.  (the  "Company"),  this will confirm  that,  in the event there shall be a
Change in Control (as  hereinafter  defined) and thereafter your employment with
the Company  terminates  Without Cause (as  hereinafter  defined),  you shall be
entitled to the following benefits:

      (a)If your  employment  terminates  prior to the first  anniversary of the
date of the  Change  in  Control,  you shall be  entitled,  in lieu of any other
severance pay (except as provided below), to a lump sum payment,  payable within
30  days  of the  date  your  employment  terminates,  equal  to the  sum of the
following:

         (i)      two times your base salary in effect on the Change in Control
date; and

         (ii) your Target  Bonus (as defined in the  Company's  Executive  Bonus
Plan (the "Plan")) for the year in which your termination  occurs,  prorated for
the number of months of service during that year prior to the termination; and

         (iii) your full Target  Bonus for each of the two years  following  the
year in which your termination occurs.

      (b)If your employment  terminates on or after the first anniversary of the
date of the  Change  in  Control,  you shall be  entitled,  in lieu of any other
severance  pay, to a lump sum payment,  payable  within 30 days of the date your
employment terminates, equal to the sum of the following:

         (i)      one time your base salary in effect on the Change in Control
date; and

         (ii) your Target Bonus for the year in which your  termination  occurs,
prorated  for the  number of months of  service  during  that year  prior to the
termination; and

         (iii) your full Target Bonus for the year  following  the year in which
your termination occurs.

      The value of each Target Bonus  payable  hereunder  shall be determined in
accordance with the provisions of Section  7(g)(4) of the Plan, as amended.  The
number of shares of

                                       -2-

Company  Common Stock awarded for partial years shall be determined by prorating
the Closing  Price (as  defined in the Plan)  based on the Closing  Price of the
Common  Stock  on  December  31  immediately  preceding,   and  on  December  31
immediately  following,  a date  which  is two  years  prior  to the  date  your
employment terminates.

      Notwithstanding  anything  herein  to  the  contrary,  in  the  event  the
aggregate  present  value,  determined in a manner  consistent  with  applicable
provisions of Section 280G of the Internal Revenue Code of 1986, as amended (the
"Code") and Treasury  Regulations  promulgated pursuant thereto, of the benefits
and/or  payments  provided  to you under the terms  hereof  that are  treated as
Parachute  Payments (as hereinafter  defined),  along with the aggregate present
value  (determined  in the same manner) of all other  payments  and/or  benefits
provided  to you by the Company  that are also  treated as  Parachute  Payments,
exceeds  three times your Base Amount (as  hereinafter  defined),  the  benefits
and/or payments to which you are otherwise entitled under the terms hereof shall
be reduced to the extent  necessary so that the  aggregate  present value of all
Parachute  Payments to which you are entitled  hereunder and any other agreement
or  arrangement  with the Company shall not exceed three times your Base Amount.
The reductions  required under this paragraph,  if any, shall be applied, to the
extent  possible,  to all payments  and/or  benefits to which you are  otherwise
entitled  under  this  Agreement  in  proportion  to the  Present  Value of such
payments  and/or  benefits,  and  otherwise in such manner as the Company  deems
appropriate  at its  discretion.  In the event you  receive  Parachute  Payments
having an aggregate present value in excess of three times your Base Amount, you
agree that you are not  entitled  to retain and shall  immediately  repay to the
Company,  in cash,  the excess of the  aggregate  present  value of all payments
and/or benefits which constitute  Parachute  Payments over three times your Base
Amount.  For  purposes  of this  paragraph  the  following  terms shall have the
meanings set forth below:

      "Parachute Payment" means any payment to you in the nature of compensation
that  constitutes a "parachute  payment" as that term is defined in Code Section
280G(b)(2); and

      "Base  Amount"  means the  amount  which is  determined  to be your  "base
amount" as that term is defined in Code Section 280G(b)(3).

      Termination of your  employment  with the Company Without Cause shall mean
(a)  termination  by the Company  without  Cause (as defined in your  Employment
Agreement  with the  Company),  or (b)  termination  by you by reason of (i) the
Company's  failure to make any of the  payments,  or provide any of the material
benefits (or their  equivalent),  under the terms of your  Employment  Agreement
with the Company,  or (ii) any material  adverse  change in your  position,  the
location   of  your   primary   workplace,   the  scope  of  your   duties   and
responsibilities, or your compensation and benefits.

      A "Change of Control"  shall be deemed to have  occurred upon the earliest
to occur of the following events:  (a) the sale or disposal of substantially all
of the  assets  of the  Company,  or (b) the date any  entity,  person or group,
within the meaning of Section

                                       -3-

13(d)(3) or Section 14(d)(2) of the Securities Exchange Act of 1934, as amended,
other than the Company or Citigroup or any of their  subsidiaries,  any employee
benefit plan (or related trust) sponsored or maintained by the Company or any of
its subsidiaries,  or any other person or group in which the present  management
of the Company  shall have an  aggregate  equity  interest,  on a fully  diluted
basis, of no less than 15%, shall have become the beneficial  owner of, or shall
have  obtained  voting  control  over,  more  than  fifty  percent  (50%) of the
outstanding  shares of (i) the Company's  Common Stock, or (ii) the Common Stock
of the Company resulting from the merger or consolidation of the Company with or
into any other entity.

      In the event of a sale by the Company of its Ion  Exchange  Business,  you
may  elect,  by  written  notice  to  the  Company  within  30  days  after  the
consummation  of such sale,  to  receive  the  benefits  set forth in the letter
agreement  dated July 5, 1995  between  the Company and you, in which event this
letter agreement shall be of no further force and affect.

      If the above correctly reflects our  understanding,  please so indicate by
signing in the space provided below for such purpose.

                                           Sincerely,

                                           Richard M. Klein
                                           President and Chief Executive Officer

AGREED:

/s/ John H. Schroeder
---------------------
John H. Schroeder
</PRE><PRE>
                                                                 Exhibit 10.30
                      SENIOR EXECUTIVE EMPLOYMENT AGREEMENT

         AMENDMENT NO. 1

                  This Amendment No. 1, dated the 25 day of April, 2000, amends
the Senior Executive Employment Agreement dated June 2, 1995 between Sybron
Chemicals Inc. and Richard M. Klein (the "Agreement").  All terms capitalized
but not otherwise defined herein shall have the meaning ascribed to them in the
Agreement.

                  Pursuant  to the  approval  of the Board of  Directors  of the
Corporation of even date herewith, the Agreement is hereby amended as follows:

                  1.       The Agreement is hereby amended by replacing all
references to "NASDAQ" with "The American Stock Exchange".

                  2.       The Agreement is hereby amended by replacing all
references to "Annual Incentive Compensation Plan" with "Executive Bonus Plan".

                  3.       The Agreement is hereby amended by the addition of
the following Paragraph 12(c):

                           "(c) The value of each incentive  award payable under
                           this  Paragraph 12 shall be  determined in accordance
                           with  the  provisions  of  Section   7(g)(4)  of  the
                           Corporation's Executive Bonus Pan, as amended. To the
                           extent all or a portion of the Executive's  Incentive
                           Compensation awarded during the preceding three years
                           was paid in shares of the  Corporation's  stock,  the
                           portion  of  the  amount  payable  to  the  Executive
                           pursuant   to   Paragraph    12(b)(2)(ii)   hereunder
                           attributable to such stock awards shall be calculated
                           by  multiplying  (i) the  average  number  of  shares
                           awarded to the Executive  during such preceding three
                           years,   by  (ii)  the  fair  market   value  of  the
                           Corporation's  shares as of the date of the Change in
                           Control."

                  4.       Paragraph 13(d) of the Agreement is hereby amended by
replacing the reference therein to "90 days" with "180 days".

                  5.       The Agreement is hereby amended by the addition of
the following Paragraph 13(f):

                           "(f) The value of each incentive  award payable under
                           this  Paragraph 13 shall be  determined in accordance
                           with  the  provisions  of  Section   7(g)(4)  of  the
                           Corporation's Executive Bonus Plan, as amended."

                  6.       The Agreement is hereby  amended by the addition of
the following Paragraph 13A:

                           "13A.  Excess Parachute Gross-up Payments.
                                  ----------------------------------

                           (a) In the  event  any  amounts  payable  under  this
                           Agreement  and  under any other  plan,  agreement  or
                           arrangement  by which  the  Executive  is to  receive
                           payments  in the  nature  of  compensation  from  the
                           Corporation constitute "excess parachute payments" as
                           that term is defined for  purposes of Section 280G of
                           the Internal  Revenue  Code of 1986,  as amended (the
                           "Code") and Treasury Regulations promulgated pursuant
                           thereto,  the Executive  shall be entitled to receive
                           additional cash payments  ("Gross-Up  Payments") such
                           that,  after payment of all federal,  state and local
                           income  taxes and federal  excise taxes on the excess
                           parachute payments and on the Gross-Up  Payments,  he
                           will have a net  amount  equal to the amount he would
                           have received  under the terms of this  Agreement and
                           under  any  other  plan,   agreement  or  arrangement
                           pursuant  to  which  the   Executive  is  to  receive
                           payments  in the  nature  of  compensation  from  the
                           Corporation (but not including the Gross-Up Payments)
                           if no portion of such payments  and/or  benefits were
                           treated as excess parachute  payments for purposes of
                           Code Section 280G.

                           (b) The initial  determination  of whether a Gross-Up
                           Payment is required  and the amount of such  Gross-Up
                           Payments shall be made by the Corporation's regularly
                           engaged certified public accountants (the "Accounting
                           Firm").  The Accounting  Firm shall provide  detailed
                           calculations  to the  Corporation  and the  Executive
                           within 30  business  days of being  requested  by the
                           Executive to make a Gross-Up  Payment  determination.
                           If the  Accounting  Firm  determines  that a Gross-Up
                           Payment  is  required,   the   Gross-Up   Payment  so
                           determined  shall be paid  within five days after the
                           receipt of the Accounting  Firm's  determination.  If
                           the  Accounting  Firm  determines  that  no  Gross-Up
                           Payment  is  payable  to the  Executive,  it shall so
                           advise the Executive in writing. If,  notwithstanding
                           the  Accounting  Firm's  initial  determination,  the
                           Internal  Revenue  Service,  any applicable  state or
                           local tax authority or any court having  jurisdiction
                           over this matter  determines  that the  Executive was
                           the  recipient of excess  parachute  payments  and/or
                           that the  Executive is required to pay an excise tax,
                           the applicable  Gross-Up Payment or the amount of any
                           underpayment  of  Gross-Up  Payments  shall  be  paid
                           promptly by the Corporation to the Executive.

                  7.       The Agreement in all other respects is hereby
ratified and confirmed.

                  IN WITNESS WHEREOF, the parties have executed this Amendment
No. 1 as of the date first set forth above.

                                                   SYBRON CHEMICALS INC.

                                             By:   /s/ Richard M. Klein
                                                   ----------------------------
                                                       Richard M. Klein

</PRE>

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