Pleatco PA25-M4 Replacement Cartridge for Hayward, Star-Clear C-250 (MICROBAN), 1 Cartridge Replacement cartridge for Hayward, star-clear c-250 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-4950 and filbur FC-2390M; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algae Measures 7-inches in diameter by 9-11/16-inches in length and 3-inches of top and bottom hole diameters