EXHIBIT 31.1

                                 CERTIFICATIONS

I, Michael A. McManus, Jr., certify that:

I have reviewed this quarterly report on FORM 10-Q of MISONIX, INC.;

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;

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 registrant as of, and
for,  the  periods  presented  in  this  report;

The  registrant's  other  certifying  officer(s)  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)) [*** Omitted pursuant to extended
compliance  period]  for  the  registrant  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  registrant,  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)  [***  Omitted  pursuant  to  extended  compliance  period];

(c)  Evaluated  the  effectiveness  of  the registrant's disclosure controls and
     procedures  and  presented  in  this  report  our  conclusions  about  the
     effectiveness  of  the disclosure controls and procedures, as of the end of
     the  period  covered  by  this  report  based  on  such  evaluation;  and

(d)  Disclosed  in  this  report any change in the registrant's internal control
     over  financial reporting that occurred during the registrant's most recent
     fiscal  quarter  (the  registrant's fourth fiscal quarter in the case of an
     annual  report)  that  has  materially affected, or is reasonably likely to
     materially  affect,  the  registrant's  internal  control  over  financial
     reporting;  and

The  registrant's other certifying officer(s) and I have disclosed, based on our
most  recent  evaluation  of  internal  control over financial reporting, to the
registrant's  auditors  and  the  audit  committee  of the registrant'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  registrant'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 registrant's internal control
     over  financial  reporting.

Date:  February 6, 2004

/s/  Michael A. McManus, Jr.
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Michael A. McManus, Jr.
President and Chief Executive Officer


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