The product is larger than the surface area, porosity variable material is lighter than water, multilayer intensive cutting of air bubbles in the water evenly Zhang Zhan improve dissolved oxygen transfer coefficient. Due to the special structure of the filaments, and thus the specific surface area after the hanging membrane exponentially increases, hanging film easily Tuomo biofilm activity. It can be widely used for the treatment of various types of micro-contamination of sewage clean up water and tap water source.