The elastic filler has the advantages of fast membrane hanging, easy membrane removal and good biofilm growth and renewal. Resistance to high load impact, high CODcr removal rate, good treatment net profit, good oxygenation performance, can carry out multi-level impact on bubbles, intensive cutting, can greatly improve the oxygen transfer utilization rate, reduce power consumption, novel structure. Large effective specific surface area, no agglomeration, no blockage, long service life, but also can be reused, production operation and management is simple. Strong adaptability, low concentration of domestic sewage, printing and dyeing wastewater, papermaking wastewater, oil wastewater, high concentration of food industry wastewater, chemical wastewater, etc., have a good treatment effect. It can be widely used in aerobic, aerobic and anaerobic treatment processes.