EXHIBIT 5




                                 August 11, 2011

Flexible Solutions International, Inc.
615 Discovery Street
Victoria, British Columbia
Canada V8T 5G4

     This letter will  constitute  an opinion  upon the  legality of the sale by
Flexible  Solutions  International  Inc., a Nevada  corporation,  and by certain
shareholders  of the Company,  of up to 945,000  shares of Common Stock,  all as
referred to in the Registration  Statement on Form S-8 filed by the Company with
the Securities and Exchange Commission.

     We have examined the Articles of Incorporation,  the Bylaws and the minutes
of the Board of Directors of the Company and the applicable laws of the State of
Nevada, and a copy of the Registration  Statement.  In our opinion,  the Company
has duly authorized the issuance of the shares of stock mentioned above and such
shares when sold, will be legally issued, fully paid, and nonassessable.

                                  Very truly yours,

                                  HART & TRINEN


                                  By /s/ William T. Hart
                                     --------------------
                                     William T. Hart