Pleatco PVT30WH-M Replacement Cartridge for Vita Spa AB5-300 (MICROBAN), 1 Cartridge Replacement cartridge for vita spa ab5-300 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 FC-3052; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 8-1/2-inches in diameter by 6-3/4-inches in length and 2-3/8-inches of bottom hole diameter