Pleatco PWWCT200 Replacement Cartridge for Waterway Clearwater II 200-Square-Foot Cartridge, p/n 817-0200N, 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 23-1/4-by-4-by-4-inches Made in the USA