EXHIBIT 32.2 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MISONIX, INC. (the "Company") on Form 10-K for the period ending June 30, 2004 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Richard Zaremba, Vice President, Chief Financial Officer, Treasurer and Secretary of the Company, certify, pursuant to 18 U.S.C. ss. 1350, as adopted pursuant to ss. 906 of the Sarbanes-Oxley Act of 2002, that: (1) The Report fully complies with the requirements of section 13(a) or 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 result of operations of the Company. Dated: September 15, 2004 /s/ Richard Zaremba ---------------------------------------- Richard Zaremba Vice President, Chief Financial Officer, Treasurer and Secretary A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to MISONIX, INC. and will be retained by MISONIX, INC. and furnished to the Securities and Exchange Commission or its staff upon request. 1 Schedule II MISONIX, INC. Valuation and Qualifying Accounts and Reserves Years ended June 30, 2004, 2003 and 2002 Column A Column B Column C Column D Column E Additions (Recoveries) Balance at Charged (Credited) Additions Balance at Beginning to cost and (deductions)- end of Description of period expenses describe period - ------------------------- ----------------- --------------------- --------------------- ----------------- Allowance for doubtful accounts: Year ended June 30: 2004 $ 644,157 $ (112,420) $ (74,721) (A) $ 457,016 2003 $ 223,413 $ 409,952 $ 10,792 $ 644,157 2002 $ 157,761 $ 97,210 $ (31,558) (A) $ 223,413 Valuation allowance for deferred taxes: Year ended June 30: 2004 $2,582,225 $ 77,709 $ (51,641) (B) $ 2,608,293 2003 $2,363,920 $ 218,305 -- $ 2,582,225 2002 $2,030,514 $ 333,406 -- $ 2,363,920 (A) Reduction in allowance for doubtful accounts due to write-off of accounts receivable balance. (B) Reduction in valuation allowance for deferred taxes with respect to non-cash compensation charge due to increase of the Company's stock price. 2