[Material Specifications]100% polyethylene material, recyclable; diameter 50mm, 25kg filter sand can be replaced, weight 700g, washable. [Function]-Filter the smallest water impurities to make your swimming pool clean and comfortable [Features]-Light weight, high strength. It is durable and can help you clean the pool. The filtering effect is excellent. Strong dirt absorption capacity. Reuse:The voids of the filter layer are reduced in the flow direction, the porosity distribution is small, the filtration rate of the formation is fast, the interception is large, it can be reused, renewable, and save energy, time and energy. [Simple and efficient]-Pour the water on the machine to filter water, the filter ball is convenient to use, and the effect is significant