[Size]: Massage bathtub filter element replacement, opening: 150mm; length: 210mm; Coarse thread: 38 mm. Measure your return water filter before ordering and compare it with the size of this filter [Applicable Model]: Replace Pleatco PWW50-P3, PWW50P3, Unicel 6CH-940, Filbur FC 0359, Waterway Plastics 817-0050, 03FIL1400, 25252, 378902 [Sturdy and durable] The entire filter adopts an unbreakable handle, a high-fluidity ABS inner core and a thick filter cloth to form a sturdy and durable body, which has strong strength and resistance to corrosion at high temperatures. [Foldable Design]: More folds of the filter element means improved filtering capacity. The three-layer laminated polyethylene inner net is covered with a weather-resistant and tear-resistant top layer, which can keep the pleats clear, well-defined and evenly spaced [Long service life]: The unique structure of the filter cloth makes it easier capturing and removing stains. Therefore, you can easily clean the filter after use. The filter has been tested and can be used for a long time with regular cleaning. Use this filter with pleasure. Features: Advanced Filter: A filter with a lot of fibers can trap more dirt. Free Flow Core technology: better fluidity, increased filter life. Longer lifespan: lower cleaning frequency and longer lifespan. Filter characteristics: Material: polyester fiber. External diameter: 150 mm. Thread: 38.1mm. Height: 210mm. Water temperature: 2540. Pressure: 35Mpa. Replacement cycle: 4-6 months. Replacement Model: Spa Replacement Filter, Unicel 6CH-940, Pleatco PWW50P3, PWW50-P3, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 378902 and 03FIL1400. Note: These filters do not apply to the new Canadian spa (Chinese spa), but only to the original Canadian spa (Pacific spa). Note: The data are all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.