Description: The pool filter Ball is an Eco-Friendly Pool Filter Sand Replacement, more efficient, lighter weight, it is designed to replace the filter sand for pool sand filters. 1.5 lbs pool filter ball is equivalent to 50lbs pool filter sand. Suitable for cleaning swimming pools and other kinds of pools, fish tanks, aquariums, and so on. And it fits all existing sand or glass filters. Perfect sand filter clears the water and makes you and your children enjoy swimming more. No sand in the pool, clear and clean water. Pool filter ball is made of polyester, polypropylene spherical filter and acrylic fiber, with the advantages of high filtration strength, fast filtration speed, long service life, reusable, good elasticity and low loss. Different from sand, the filter ball will not block your filter, and it only requires less backwash for maintenance purposes. And they are completely and can be 100% recycled. Specification: Material: Fiber Diameter: 4cm/1.6inch Package Includes: 1 set Pool Filter Balls