4 X Intex Purespa Hot Tub Filter S1 Reusable Foam Pure Spa

4 x pack of Biofoam filters to fit Intex Purespa hot tubs. Will wash and can be reused giving far longer life than the standard S1 Intex cartridges It is very important that your water is not over chlorinated as the foam will decompose, always remove filter when using a chlorine shock treatment (not necessary to remove when using a non chlorine or oxy shock treatment). Filter works perfectly when correct chemical levels are maintained in your tub. Discoloration of the filter will occur this is normal Please use a warm soapy water mixture to clean out the foam filter which will then need to be thoroughly rinsed out after with clean water to remove all the suds clean filters more often for longer life.