Pleatco Replacement Cartridge for Sta-Rite Posi-Flo II PTM70, T-70TX, T-70TXR, 70GPM-TX, 70TX, 70TXR, Open with 12 Concentric Slots (MICROBAN) Replacement cartridge for sta-rite models posi-flo ii ptm70, t-70tx, t-70txr, 70GPM-tx, 70tx, 70txr 50 Percent open ABS free flow cores maximize water flow through reemay filter media Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span Replaces unicel UHD-SR70 and filbur FC-2540; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 8-11/16-inches in diameter by 18-3/16-inches in length and 4-3/16-inches of top and bottom hole diameters