Material of swimming pool filter balls: The filter balls are made of polyester, lightweight material, high permeability, non-toxic, strong adsorption capacity and long service life.The swimming pool filter ball has been designed to replace filtration sand for swimming pool sand filters.800g of swimming pool filter balls is equivalent to 28kg of swimming pool filter sand, the much lighter weight makes filtration work an easy task. Significant filtering effect: Filter balls for easy and quick cleaning of the pool.4 times faster filtration speed than traditional filter media, higher recovery capacity.It can capture tiny suspended matter, also filters fats and impurities. Durable and Energy Saving: The swimming pool filter balls can be washed and reused.Unlike sand, the swimming pool filtration ball does not clog your filter and requires less backwashing for maintenance. Premium filter media extends filter life and is a perfect replacement for filtration sand, filtration glass and other media (Tips: Place the filter balls in a laundry bag and machine wash them) Widely used: The filter balls are not only used for swimming pool cleaning filter system, but also can be used for water filtration in aquarium, swimming pool, filtration pump, aquarium andeven the drain.