Environmental protectionThe filter ball is made of polyethylene, a specially treated environmental material, which has good durability, water permeability, recyclability and environmental sustainability. Powerful FunctionThe 700g filter ball can replace 25kg filter sand, quartz sand or 25kg filter glass. It can save you a lot of time and make it easier to refill your filtration system. Durable and energy efficientThe filter ball has a very high dirt-holding capacity, is very durable and easy to clean. Machine washable or hand washable and reusable. By eliminating the winding, you save energy, cost, other pool accessories and protect the environment. Wide ApplicationThese filter balls are suitable for filtration of swimming pool and the aquarium. Can also replace filter sand. It is suitable for filtration of filters, buckets, swimming pools, etc. It can effectively filter suspended fine matter and improve water quality. Suitable for all sand filter systems Premium ServiceOur mission is to provide a premium shopping experience that puts the customer first. We firmly believe in our ability to provide a comfortable shopping experience for every customer. If you have any questions about the filter balls, please feel free to contact us. Specification: Weight: 700 grams Diameter: 5mm A special feature: Made of 100% recyclable polyethylene, 100% recyclable 700 g filter ball instead of 25 kg filter sand - lighter and more effective! Filter suspended solids, high adsorption capacity, lower flow resistance than filter sand EASY TO USE: Simply remove any sand residue or glass of the filter cartridge and clean it. Then simply fill the filter balls - done! One note: 1. Do not expose to direct sunlight! 2. Do not use for industrial water purification (Chemicals in industrial water may corrode the filter ball and cause the filter ball to fail.) We are committed to providing you with a better service. Hope you like our products and wish you a happy life!