Pleatco Replacement Pool and Spa Filter Cartridge - PTL50W-SH-XP Replacement cartridge for la spa ASD turbo master 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-6603and filbur FC-3088 ; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 6-inches in diameter by 14-13/16-inches in length and 1-7/8-inches in bottom hole diameter