Features 1. Pool filter media is designed to replace the filter sand for pool sand filters. 2. Perfect for summer pool sand filter and others water filter, clear water makes you and your children enjoy swimming more. No sand in the pool, lighter and more efficient than traditional filter sand 3. Spherical fiber filter is made of polyester, polypropylene spherical filter and acrylic fiber. It has the advantages of high filtration strength, fast filtration speed, long service life, reusable, good elasticity and low loss 4. Unlike sand, the filter ball does not block your filter and requires less backwash for maintenance purposes. Premium filter media extends filter life and is a perfect replacement for filter sand, filter glass and other media. Specifications: Material: Polyethylene Weight: 500g/700g Package Included: 1 Bag x Pool Filter Balls Notes: 1. Manual measuring, please allow 1 ~ 3mm error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.