Filter balls are the perfect alternative to swimming pool filter sand, providing longer service life, not clogging the filter, and reducing backwash. Removes tiny suspended solids that are difficult to settle, with higher filtration speed performance than other sand filter media (approximately equal to 70 pounds of swimming pool filter sand). HIGH QUALITY MATERIAL: The filter ball is made of 100% polyester fiber, which has the advantages of high filtration precision, high dirt interception capacity, high backwash cleanliness and low water consumption. Granular filter material is a filter material. Reusable: The product comes with a mesh bag made of high-quality polyester fiber, which is easy to clean and can be machine washed or directly hand washed. Wide Application: The filter balls are compatible with all pool filters, including sand filters, cartridge filters and DE filters, also suitable for aquariums and fish tanks, lighter and more efficient than filter sand, clear water for you and your happy kids swimming Colour:White Material:fiber Package Contents: 1set * swimming pool filter balls (900g) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.