Suspended spherical packing is a relatively new product developed on the basis of numerous sewage treatment packing materials. It is mainly used as a biofilm carrier, and also has the function of intercepting suspended solids. It has the advantages of strong biological adhesion, large specific surface area, high porosity, good chemical and biological stability, durability, no harmful substances dissolved, no secondary pollution, UV protection, anti-aging, strong hydrophilicity, etc. It is impossible to achieve any soft, semi soft, combination, elastic filler.