Swimming Pool Filter BallThe pool filter ball is made of 100 polyester, an ultralight and environmentally friendly material that has excellent durability, good water permeability and good drainage. Highly elastic pool filter balls can filter impurities from water quickly and powerfully. Reliable Pool Sand Filter: Pool filter balls have high filtration speed, low energy efficiency, high adsorption capacity and long service life. These Pool Filter Balls can capture microscopic suspended matter that is not easily removed by sediment, resulting in a cleaner pool. Easy to use: The pool filter ball has been designed to replace filter sand for pool sand filters. 500g pool filter balls equals 18kg pool filter sand, Unlike sand, the pool filter ball does not clog your filter and requires less backwashing for maintenance. Widely Used: Equivalent to 18kg of pool filter sand, but more energy efficient than traditional filter sand. These filter balls are not only used in pool cleaning and filtration systems, but also suitable for swimming pools, aquariums, filter pumps, aquariums and other media. Recyclable and ReusableAfter use, you can put the filter ball into the laundry bag and wash it in the washing machine to remove dirt on the surface. Once dried, it can be reused. When not in use, please keep it in a closed bag, which is environmentally friendly.