Polysphere Pool Filter Balls Polysphere Bestway 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 looks fool you. FlowClear polyspheres provide several benefits and can be used in all existing Bestway sand filters. They enhance sand pump efficiency by lowering pressure, allowing for a higher flow rate and longer product life. Polyspheres are made with lighter materials. In fact, 500 grams of polysphere is equal to 18 kilograms of sand. They provide superior filtration. Clean, transparent water is achieved in a shorter time than sand. The polyspheres are made from 100% recyclable and non-toxic PET materials. It's even hand washable. Flowclear polyspheres are a great way to enhance your above ground pool. * Material: 100% PET * Suitable for all sand filters in the Bestway range * Minimum pressure increase compared to sand * 500g (1.10 lbs) of flow polysphere equals 18 kg (39.68 lbs) of sand The quantity of flow polysphere is as follows : Sand filter weight if using Sand weight if using polysphere flow Bestway 2,006 L/H (530 Gal./H) 8.5 kg (18.74 lb) 240 g (0.53 lb) Bestway 3,785 L/H (1,000 gal. 18 kg (39.68 lb) 500 g (1.10 lb) Bestway 5,678 L/h (1,500 gal./h) 25 kg (55.12 lb) 700 g (1.54 lb) Bestway 7,571 L/h H (2000 gal./h) 35 kg (77.16 lb) 1000 g (2.20 lb) Notes: Flow polysphere can also be used in other sand filters that use 28 g (0.06 lb) flow polysphere to replace 1 kg (2.20 lb). * Easy to hold, manipulate and transport * Low weight for easy handling * Excellent filtration result and efficiency * Long life product * Easy to wash by hand * Back washing function by Bestway sand filter Not applicable * Easy to dispose of, non-toxic Contents: 500g (1.10 lb) flow polysphere