Pleatco PWC25 Replacement Cartridge for Waterco C-25, 1 Cartridge Replacement cartridge for waterco c-25 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-7427 and filbur FC-5125; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 7-1/4-inches in diameter by 9-7/8-inches in length and 3-inches of top and bottom hole diameter