VICAMB 4.7 lbs Pool Filter Ball for Sand Filter Pump,Reusable Swimming Pool Fiber Media Balls,Replace Pool Filter Sand for Aquarium Tank,Pools Sand Filters SystemsBrand: VICAMB Color: Blue Features: Substitute for filter sand: These pool filter balls are the perfect alternative to sand filters. Filter balls are not only lightweight but also provide better filtration than filter sand. The filter balls don't take much time or labor to lay out before use, and during use, the filter balls don't clump like filter sand and stay in good filtration condition Quality material: The pool filter ball is made of quality