Material: 100% recyclable polyethylene. innovative and revolutionary product. polyethylene balls that filter waste. alternative to glass sand or cartridges. 700g of aqualoon is equivalent to 25kg of sand. filters impurities up to 3 microns which makes greater filtration efficiency. it requires less frequency washing, which leads to energy savings. light weight. it longers the life of the filters since it is worked with less pressure. you can wash it in the washing machine when you have too much dirt on the ball. allows excellent filtration. white color