Features: 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 Features Strong Compatibility: Compatible with PLEATCO PWW50L, UNICEL 4CH 949, and Filbur FC 0172 to ensure a perfect fit for your spa or pool filter. Filter Life Extension: Helps prolong the lifespan of the filter, safeguarding your pool or spa and delivering clean, purified water for a superior leisure experience. Easy Maintenance: Durable and easy-to-clean filtration products ensure crystal-clear and safe water for your family. Regular Replacement: Clean cartridges weekly and replace monthly or sooner for maximum efficiency and consistently clean water. Superior Performance: Professionally manufactured with outstanding craftsmanship to ensure the best and stable filter performance.