BDO Seidman, LLP
                       205 N. Michigan Avenue, Suite 2100
                             Chicago, Illinois 60601
                            Telephone: (312) 856-9100
                               Fax: (312) 856-1379

                                                                  Exhibit 16.2


December 7, 1998


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549


Re:      H.E.R.C. Products Incorporated


Ladies and Gentlemen:

We have been  furnished  with a copy of the response to Item 4 of the Form 8-K/A
for the event that  occurred  on  October  27,  1998,  to be filed by our former
client,  H.E.R.C.  Products  Incorporated.  We agree with the statements made in
response to that Item insofar as they relate to our Firm.

Yours very truly,



/s/  BDO Seidman, LLP.
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BDO Seidman, LLP