[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 construction with strong resistance to corrosion and high temperatures. [Foldable Design]: Increased folds provide greater capacity and improved filtration. The inner mesh is made of three-layer laminated polyethylene, 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 allows for easy stain removal. This enables simple cleaning and extended service life with regular maintenance. Features: Advanced filter media with high fiber density retains more debris. Free Flow Core technology improves fluidity and extends filter life. Reduced cleaning frequency and longer lifespan. Filter Specifications: Material: Polyester fiber. Outside diameter: 150 mm. Thread size: 38.1 mm. Height: 210 mm. Maximum water temperature: 40°C (104°F). 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, 03FIL1400.