<PAGE>

                                  EXHIBIT 31(a)
                     RULE 13a-14(a)/15d-14(a) CERTIFICATION

I, Roy T. Eddleman certify that:

1.       I have reviewed this report on Form 10-QSB/A of Spectrum Laboratories,
         Inc.

2.       Based on my knowledge, this report does not contain any untrue
         statement of a material fact or omit to state a material fact necessary
         to make the statements made, in light of the circumstances under which
         such statements were made, not misleading with respect the period
         covered by this report;

3.       Based on my knowledge, the financial statements, and other financial
         information included in this report, fairly present in all material
         respects the financial condition, results of operations and cash flows
         of the small business issuer as of, and for, the periods presented in
         this report;

4.       The small business issuer's other certifying officer and I are
         responsible for establishing and maintaining disclosure controls and
         procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e))
         for the small business issuer and have:

         a)   Designed such disclosure controls and procedures, or caused such
              disclosure controls and procedures to be designed under our
              supervision, to ensure that material information relating to the
              small business issuer, including its consolidated subsidiaries, is
              made known to us by others within those entities, particularly
              during the period in which this report is being prepared;
         b)   Reserved;
         c)   Evaluated the effectiveness of the small business issuer's
              disclosure controls and procedures and presented in this report
              our conclusion about the effectiveness of the disclosure controls
              and procedures, as of the end of the period covered by this report
              based upon such evaluation; and
         d)   Disclosed in this report any change in the small business issuer's
              internal control over financial reporting that occurred during the
              small business issuer's most recent fiscal quarter that has
              materially affected, or is reasonably likely to materially affect,
              the small business issuer's internal control over financial
              reporting; and

5.       The small business issuer's other certifying officer and I have
         disclosed, based on our most recent evaluation of internal control over
         financial reporting, to the small business issuer's auditors and the
         audit committee of the small business issuer's board of directors (or
         persons performing the equivalent function):

         a)   All significant deficiencies and material weaknesses in the design
              or operation of internal controls over financial reporting which
              are reasonably likely to adversely affect the small business
              issuer's ability to record, process, summarize and report
              financial information; and
         b)   Any fraud, whether or not material, that involves management or
              other employees who have a significant role in the small business
              issuer's internal controls over financial reporting

Dated: September 19, 2005

/s/ Roy T. Eddleman
Signature
Roy T. Eddleman
Chief Executive Officer
Spectrum Laboratories, Inc.

<PAGE>

                                  EXHIBIT 31(b)
                     RULE 13a-14(a)/15d-14(a) CERTIFICATION

I, Brian A. Watts certify that:

1.       I have reviewed this report on Form 10-QSB/A of Spectrum Laboratories,
         Inc.

2.       Based on my knowledge, this report does not contain any untrue
         statement of a material fact or omit to state a material fact necessary
         to make the statements made, in light of the circumstances under which
         such statements were made, not misleading with respect the period
         covered by this report;

3.       Based on my knowledge, the financial statements, and other financial
         information included in this report, fairly present in all material
         respects the financial condition, results of operations and cash flows
         of the small business issuer as of, and for, the periods presented in
         this report;

4.       The small business issuer's other certifying officer and I are
         responsible for establishing and maintaining disclosure controls and
         procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e))
         for the small business issuer and have:

         a)   Designed such disclosure controls and procedures, or caused such
              disclosure controls and procedures to be designed under our
              supervision, to ensure that material information relating to the
              small business issuer, including its consolidated subsidiaries, is
              made known to us by others within those entities, particularly
              during the period in which this report is being prepared;
         b)   Reserved;
         c)   Evaluated the effectiveness of the small business issuer's
              disclosure controls and procedures and presented in this report
              our conclusion about the effectiveness of the disclosure controls
              and procedures, as of the end of the period covered by this report
              based upon such evaluation; and
         d)   Disclosed in this report any change in the small business issuer's
              internal control over financial reporting that occurred during the
              small business issuer's most recent fiscal quarter that has
              materially affected, or is reasonably likely to materially affect,
              the small business issuer's internal control over financial
              reporting; and

5.       The small business issuer's other certifying officer and I have
         disclosed, based on our most recent evaluation of internal control over
         financial reporting, to the small business issuer's auditors and the
         audit committee of the small business issuer's board of directors (or
         persons performing the equivalent function):

         a)   All significant deficiencies and material weaknesses in the design
              or operation of internal controls over financial reporting which
              are reasonably likely to adversely affect the small business
              issuer's ability to record, process, summarize and report
              financial information; and
         b)   Any fraud, whether or not material, that involves management or
              other employees who have a significant role in the small business
              issuer's internal controls over financial reporting

Dated: September 19, 2005

/s/ Brian A. Watts
------------------
Signature
Brian A. Watts
Chief Executive Officer
Spectrum Laboratories, Inc.