This product is made of high-quality PP plastic material, which is safe, non-toxic and durable. It can absorb stool, wash sand and change water in one. Press the airbag to easily and quickly discharge water. The water pipe is resistant to oxidation and corrosion. The product has a built-in filter grid to effectively prevent fish from being Suction blocking structure, effectively remove the bottom bed debris, reduce the rate of algae burst, simple and durable maintenance.