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Exhibit 31.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND
DIRECTOR OF FINANCE AND ADMINISTRATION PURSUANT TO
RULES 13A-14(A), AS ADOPTED PURSUANT TO
SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002 I, Paul I. Mansur, Chief Executive Officer of SystemOne Technologies Inc., certify that:  1.
    
    I have reviewed this Annual Report on Form 10-KSB/A of SystemOne
Technologies 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 to 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 the
Companys 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)
    
    [Paragraph omitted pursuant to SEC Release Nos. 33-8238 and
34-47986];  c)
    
    Evaluated the effectiveness of the small business issuers
disclosure controls and procedures and presented in this report the
Companys conclusions 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 (the
small business issuers fourth fiscal quarter in the case of an
annual report) 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 the Companys 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 functions):  (a)
    
    All significant deficiencies and material weaknesses in the
design or operation of internal control 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 control over financial reporting. Date: April 29, 2004
    /s/  Paul I. MansurPaul I. MansurChief Executive Officer
(Principal Executive Officer)