Pleatco PJW23-M4 Replacement Cartridge for Jacuzzi Aero, Caressa, C/Top (MICROBAN), 1 Cartridge Replacement cartridge for jacuzzi aero, caressa, c/top models 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-5601 and filbur FC-1330; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 5-11/16-inches in diameter by 10-3/8-inches in length and 2-1/8-inches of bottom hole diameter