The Bestway Flowclear Polysphere Pool Filtration Balls are a highly efficient and environmentally friendly way to keep clean water flowing through your above ground pool. The Polyshperes look like cotton balls but don’t let the look deceive you. The Flowclear Polyspheres offer several benefits and can be used in all existing Bestway sand filters. They enhance your sand pumps efficiency by lowering pressure, which allows for a higher flow rate and a longer product lifespan. Polyspheres are made with lighter material. In fact, 500 grams of Polysphere is equal to 18 kilos of sand. They offer superior filtration. Clean and clear water is reached in a shorter time than with sand. Your Polyspheres are made from 100% recyclable and non-toxic PET material. They are even washable by hand. Flowclear Polyspheres are a fantastic way to enhance your above ground pool.