Pleatco PMA10-M Replacement Cartridge for Eco-Pur Replacement 2004 and Later (MICROBAN), 1 Cartridge Replacement cartridge for eco-pur models 50 Percent open ABS free flow cores maximize water flow through reemay filter media; microban inhibits the growth of stain and odor causing microbes Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span Replaces unicel and filbur; made in usa Measures 3-7/8-inches in diameter by 7-1/8-inches in length; measures 2-1/8-inches top hole and 2-1/8-inches bottom hole diameter