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The 6CH-940 Spa Filter Replacement PWW50P3 817-0050 Filbur FC-0359 25252 is a 2-pack of filter cartridges designed for spa use. These cartridges have a 1 1/2" SAE thread for easy installation and a circular handle for easy removal. Made of Trilobal Filtration Fabric, they offer a filtration area of 50 sq. ft and are designed with a length of 7 5/8" and an outside diameter of 6". This filter replacement is specifically designed for the 6CH-940 model, ensuring compatibility and optimal filtration performance for your spa.