[Size]: Replacement massage tub filter element, opening: 150mm; length: 210mm; coarse thread: 38mm. Measure your filter at return water before ordering and compare it with the size of this filter. [Applicable model]: Replaces Pleatco PWW50-P3, PWW50P3, Unicel 6CH-940, Filbur FC-0359, Waterway Plastics 817-0050, 03FIL1400, 25252, 378902. [Sturdy and durable]: The filter features an unbreakable handle, high-fluidity ABS inner core, and thick filter fabric to form a robust and durable body with strong resistance to corrosion and high temperatures. [Foldable Design]: Increased folds provide higher capacity and improved filtering. The inner mesh is made of laminated polyethylene in three layers, covered with a top layer resistant to weather, water, and tearing, helping to keep pleats clear, well-defined, and evenly spaced. [Long life]: The unique filter fabric structure enhances dirt capture and facilitates easy cleaning. The filter has been tested for long-term use with regular maintenance. Features: Advanced filter design with high fiber density for superior dirt retention. Free Flow Core technology ensures better fluidity and extended filter life. Reduced cleaning frequency and longer service life. Filter Specifications: Material: Polyester fiber. Outer diameter: 150 mm. Thread size: 38.1 mm. Height: 210 mm. Maximum water temperature: 40°C. Maximum pressure: 35 MPa. Recommended replacement cycle: 4-6 months. Replacement for: Spa filter models Unicel 6CH-940, Pleatco PWW50P3, PWW50-P3, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 378902, and 03FIL1400.