ReusablePool filter balls, long service life, reusable good elasticity and low loss. Significant filtering effect They are lighter and more efficient than traditional filter sand. Unlike sand, the filter ball does not clog your filter and requires less backwashing for maintenance purposes. Easy to useSuitable for all sand filters, just pour it on the machine to filter the water Wide ApplicationWhether it is a swimming pool in a garden, a swimming pool area or an aquarium cleaning. Filter the smallest impurities in the water to bring cleanliness and comfort to your swimming pool. MaterialModified fiber filler,This product has good water permeability and breathability.Does not contain toxic and harmful substances, does not affect water quality Features: -Filter balls, ecological, light and durable -Suitable for all sand filter systems -Present in the water for reusable pool cleaning Material: fiber Weight: 500g Appearance of the sphere: white, round Adsorption rate: 99% Anti-stress: 100 kgf Density: 1.45g/cm3 Porosity: 99% Packing list: 1 pack of pool cleaning balls (500g)