Pleatco PA175-M Replacement Cartridge for Hayward Star-Clear Plus C1750, Sta-Rite PXC-175 (MICROBAN), 1 Cartridge Replacement cartridge for Hayward star-clear plus c1750, sta-rite pxc-175 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 C-8417 and filbur FC-1294; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algae Measures 8-15/16-inches in diameter by 28-3/8-inches in length and 4-inches of top and bottom hole diameter