Amazon.com : U.S. Pool Supply 1.5 lbs Pool Filter Balls - Eco-Friendly Fiber Filter Media for Swimming Pool Sand Filters (Equals 50 lbs Pool Filter Sand) - Higher & More Efficient Water
VAZILLIO 3.3 lbs Pool Filter Balls for Sand Filter Pump, Reusable Eco-Friendly Fiber Filter Media for Swimming Pool Sand Filters, Aquarium Fish Tanks Sand Filters (Equals 117 lbs Pool Filter Sand)
Amazon.com : Yuemoon Pool Filter Balls for Swimming Pool Sand Filters 2.8 lbs, Pool Filter Sand Replacement, Eco Polysphere Filter Media(Equals 100 lb Pool Filter Sand) Alternative to Sand and Filter Glass (