Filter ball has good water permeability and breathability. Does not contain toxic and harmful substances, will not affect the water quality. Durable and resistant to cleaning. Can be reused, dirt can be washed. Suitable for any farming environment (seawater, fresh water can be). It can be used to filter sand in pools. Their filtration results are more accurate because they can filter particles to a size of only 3-5 microns in the pool water. The use of filter balls can significantly improve the quality and hygiene of the pool. Next generation filter material for swimming pools, replaces sand Excellent micro particle filtering Made of polyester and machine washable.Here is our company's website, you can click to know more detail information: Henan Lvyuan technology water treatment limited company