Replacement cartridge for leisure bay, dynasty spas * 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-5345 and filbur FC-2970; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea * Measures 5-5/16-inches in diameter by 10-1/8-inches in length and 2 1/8-inches of top and bottom hole diameters