EXHIBIT 99.3

Certification of Chief Financial Officer of Spectrum Laboratories, Inc.

In connection with the quarterly report of Spectrum Laboratories, Inc. and its
subsidiaries, SLI Acquisition Corp., Spectrum Europe B.V. and Spectrum
Chromatography (collectively, the Company) on Form 10-QSB for the quarter ended
September 28, 2002 as filed with the Securities and Exchange Commission on the
date hereof (the "Report"), Brian A. Watts, Chief Financial Officer of the
Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.       the Report fully complies with the requirements of Section 13(a) or
         Section 15(d) of the Securities Exchange Act of 1934; and

2.       the information contained in the Report fairly presents, in all
         material respects, the financial condition and results of operations of
         the Company.

Dated: November 12, 2002.


/s/ Brian A. Watts
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Brian A. Watts
Chief Financial Officer
Spectrum Laboratories, Inc.