1.Highquality material: our filter cartridges are made of highquality mixed materials and are durable, which supports the filter against deformation at high water pressure. For clear and bottomless swimming pool water and the performance of the swimming pool pump 2.EFFECTIVE CLEANING: The filter cartridges facilitates the release of impurities during cleaning and ensures that the filter feels like after each wash. For optimal performance, it is recommended to clean the cartridges once a month. 3.POWERFUL FILTRATION CAPACITY: Our unique trilobal filter fabric provides an enlarged surface area and optimizes back pressure in your filter system. This ensures consistently clean, fresh and clear water in your pool or spa. 4.More durable: the filter cartridges is made of a highstrength polypropylene flow core, which protects the filter from deformation at high water pressure. At the same time, additional straps help maintain the kink distance and increase the longevity of the filter cartridge.