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 spa filter is compatible with PRB50-IN, Unicel C-4950, Aladdin 15002, 03FIL1600,817-5000, 435-0037, R173434, 06-0012-12, SD-00201, PLE-051-0088, 6540-471, Jacuzzi J210/J220/J235/J245/J275 Hot Tub Filter. All manufacturers' names and part numbers are used for compatibility information only. Dimensions.Length: 13 5/16”; Outside Diameter: 5”; Top Hole: 2 1/8” Open; Bottom Hole: 2 1/8” Open. Filtration Area: 50 Sq.ft. The PRB50-in hot tub 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 C-4950 hot tub 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.