Pleatco PXST150-M Replacement Cartridge for Hayward X-Stream CC1500, (MICROBAN), 1 Cartridge Replacement filter for pool and spa cleaning systems 50% open ABS free flow cores maximize water flow through REEMAY filter media; Microban inhibits the growth of stain and odor causing microbes like bacteria and algea Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span 23-1/4-by-4-by-4-inches Made in the USA