[Material specifications] Material 100% polyethylene, recyclable; diameter 50mm, 25kg filter sand can be replaced, weight 700g, washable. [Function]-Filter the smallest impurities from the water to make your swimming pool clean and comfortable [Features]-Light weight, high strength. It is durable and can help you clean the swimming 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 formation filtration speed is fast, the interception is Importantly, it can be reused, renewable and save energy, time and energy. [Simple and effective]-Pour the water onto the machine to filter the water, the filter ball is convenient to use and the effect is significant