Pleatco PXST125-M Replacement Cartridge for Upgrade to Hayward X-Stream 100 (MICROBAN), 1 Cartridge Replacement cartridge for upgrade to Hayward x-stream 100 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 and filbur; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 8-15/16-inches in diameter by 17-3/8-inches in length and 4-inches of top and bottom hole diameters