The combination of fillers combines the advantages of soft and semi soft fillers, with a structure supported by plastic rings and evenly distributed fiber bundles, which do not collapse, clump, or block easily. Large specific surface area, high porosity, fast film-forming speed, sufficient microbial attachment, and strong biochemical degradation ability. Uniform water and air distribution can effectively cut bubbles, improve oxygen utilization efficiency, and significantly enhance nitrogen and phosphorus removal and degradation in sewage treatment