[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. Designed to resist corrosion and withstand high temperatures. [Foldable Design]: Increased pleat count provides higher dirt capacity and improved filtration. The inner mesh is made of laminated polyethylene with three layers, covered by 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 cleaning. With proper maintenance, the filter offers extended service life. Features: Advanced filter media with high fiber density for superior dirt retention. Free Flow Core technology promotes better water flow 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: 40C (104F). Maximum pressure: 35 MPa. Recommended replacement cycle: 46 months. Replacement for: Spa filter models Unicel 6CH-940, Pleatco PWW50P3, PWW50-P3, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 378902, 03FIL1400. Note: Not compatible with new Canadian spa models (Chinese spa); designed for original Canadian spa models (Pacific spa).