Compatible Models. Replacement Hot Tub filters Compatible for PWW50-P3(NOT PWW50-P4), PWW50P3, for Unicel 6CH-940, for Filbur FC-0359, for Waterway Plastics 817-0050, 25252, 378902, 03FIL1400ect. Note: All referenced manufacturers' names and part numbers are the trademarks of their respective owners. Mentioned for compatibility purposes only.PWW50P3 Filter Specifications. Diameter: 6"; Length: 7 5/8"; Filter Material: Advanced Point Bonded Filtration Fabric; Filter Area: 50 sq. feet; Material Weight: 3 oz/yd; Core: Free Flow Core; Port Thread: 1 1/2" SAE Coarse Thread.Premium Filtration Performance. Innovated "Dirt-Locking" technology makes the fabric traps much more contaminants than regular fabric. This filter efficiently removes hair, leaves, dust, sediment, sand, etc. Enjoy clean leisure time in your pool and spa.Easy To Clean&Install. Uniformity and high-performance trilobal fabric make it easier to capture and release stains, so it's easy for you to wash the filter after use. It is recommended that you replace cartridges every 2 weeks to maximize your spa's performance.