Compatible with Pleatco PWW50L, Unicel 4CH-949, Filbur FC-0172, SD-01143, 817-4050, PDC570-AFS, Rising Dragon 50, Baleen AK-90091, Magnum O250, Darlly 42522. Endorsed by or affiliated with brands it fits including Pleatco, Unicel, Filbur, Waterway etc. The filter is made of high quality 100% polyester material. The polyester material allows the filter element to last longer than cheaper alternatives. The filter material easily releases impurities when cleaning the filter, and it looks like new after cleaning. It is recommended that the filter element be cleaned every 2 weeks to maximize spa performance. More cartridge pleats mean increased filtration capacity, and the three-layer laminate structure captures more contaminants than ordinary filter cartridges. This filter effectively removes hair, leaves, dust, deposits, sand, etc. These filters provide safe, clean and pure water that inspires the highest feeling of well-being. Enjoy your unique summer moment.