1. quality material: Made of 100% polyethylene, lightweight and recyclable, it does not pollute the environment. It features filtration resistance, a soft and fluffy cottonlike appearance, permeability, and a long service life. 2. Wide range of applications: Filter balls are universally suitable for various sand filter systems, preventing clogging and compatible with saltwater. Whether for garden pools, aquariums, filter pumps, fish tanks, or filter buckets, they effectively remove suspended particles and improve water quality for crystalclear water. 3. Outstanding filtration performance: Just 500g replaces 18kg of filter sand or glass filter trays. Unlike sand, filter balls do not clog your system and require less backwashing for maintenance. Lighter in weight, more efficient, and reducing backwash time. 4. cleaning power: The filter balls boast dirtholding capacity. While traditional filter sand can only filter particles around 40 microns, our filter balls for sand filter systems can trap particles as small as 1 micron, with a filtration speed 34 times faster than conventional filter media.