Real Fancy's pool & spa filter is dedicated to bringing purer and cleaner water to your pool. You can experience the joy of being in the water with more peace of mind. Replacement Filter.The hot tub filter is compatible with PWW50P3(Not PWW50P4), Unicel 6CH-940, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 378902, 03FIL1400, HTF0245RT, 1 1/2" SAE Thread Screw in Filter. All manufacturers' names and part numbers are used for compatibility information only. Dimensions.Length: 8 1/4''; Outside Diameter: 6''; Bottom:1 1/2" SAE thread; Top:Circular Handle; Filtration Area: 45 sq. ft. The FC-0359 spa filter has ultra-high water filtration capacity. It can effectively remove hair, leaves, dust, sediment, sand, and other fine particles, easily remove debris, and always keep the water clean. The 6CH-940 spa filter is washable and reusable. Simply remove and rinse with water, and the cleaned filter will be a new one. It is recommended to clean the filter every two weeks to fully utilize its performance.