Welcome to our store [Material Specifications] - Polyethylene material, recyclable; 50mm in diameter, can replace 25kg filter sand, weighs 700g, can be washed. [Functions] - Filtering out the smallest impurities in the water aims to bring your swimming pool clean and comfortable [Features] - Lightweight, high strength. It is durable and can help you clean the swimming pool. Provides excellent filter result. Great dirt absorption capacity. [Reuse] -The empty space of the filter layer decreases in the flow direction and porosity distribution is small, forming fast filtration rate, large interception, being reusable and renewable, saving time and energy. [ Easy and effective] - Just pour it on the machine to filter the water, the filter balls are easy to use, but with an effective result