Used in StarClear C-250 , Pentair Commander, and Waterco UlltraMite and HydroMite Canisters. 25 square feet of 4 oz. paper. 3" hole on both ends. Found in Hollibaugh, PDC, Sonoma Spas, and many stand-alone applications on skid pads. MFG # 12509 , 12512 , 17-175-1197 , 17-175-1311 , 24240-0016 , 27-078 , 46095 , 46115 , 4900-93 , 57005700 , 645544006158 , 645544012302 , AK-6073 , AK-6074 , C-7425 , C-7626 , CX250-RE , FC-0615 , FC-1230M , FC-3414 , PA25 , PA25-M , PC-1230 , PCM25 , PLE-051-9204 , PLE-051-9290 , PPC25 , R173208 , SC741 , WC108-140SI