Combined porous ring filler, 40 square holes are placed around the plastic ring, and eight bundles of aldehyde filaments are distributed around it. Each bundle of filaments is connected with 4 square holes, so that the firmness of the aldehyde filament on the plastic ring is self-evident. In the case of strong aeration turbulent water airflow, it is ideal to choose a filler. Porous ring packing and combined bicyclic packing are largely the same in the wastewater treatment process.