Pleatco PJ25-IN-M4 Replacement Cartridge for Jacuzzi CFR/CFT 25, 1 Cartridge Replacement cartridge for jacuzzi CFR/CFT 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-5625 and filbur FC-1425; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 5-inches in diameter by 13-1/4-inches in length and 2-3/8-inches of top and bottom hole diameters