Feature: 1. Strong Compatiblity: Change filter to get purer water in your pool or spa with these alternative cartridges compatible with for PLEATCO PWW50L, for UNICE 4CH 949, and for Filbur FC 0172. 2. Filter Life Extending and Self Relax: Can help extend the life of filter and protect your pool or spa. Deliver safe and purified water to provide the best leisure experience. 3. Convenient to Clean: Filtration products are designed to be durable and easy to clean, so you can keep your pool and spa pool clear and safe for you and your family. 4. Replace Once A Week: For maximum efficiency, clean cartridges once a week and change them monthly or earlier. Maintain the performance of the filter to provide you with clean water. 5. Good Performance: Though professional manufacturing and superb craftsmanship, the pool filter pormotes the performance which is best and stable. Specification: Item Type: Spa Filter Product Material: Polyester Mesh Weight: Approx. 700g / 24.70oz Product Size: Approx.378x125mm/12.88x4.92in Application: For hot tub, spa, children swimming pool, etc. Package List: 1 x Pool Filter