Pleatco PJW50 Replacement Cartridge for Jacuzzi Whirlpool 50, C/Top, Front Load, 1 Cartridge Replacement filter for pool and spa cleaning systems 50% 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 10-3/8-by-2-1/8-inches with loop handle Made in the USA