Pleatco PWW150-4 Replacement Cartridge for Waterway Pool 150, Leisure Bay WW-150, 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 25-1/4-by-6-by-6-inches Made in the USA 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 25-1/4-by-6-by-6-inches. Material weight: 4 ounces per yard squared (oz/yd2) Made in the USA