Several corrosion-resistant, temperature resistant, and aging resistant varieties of polyolefin and polyamide are used for the screening of elastic fillers. Hydrophilic, adsorption resistant, and heat-resistant oxygen resistant additives are mixed together, and special wire drawing and strand making processes are used to interweave the strands on a corrosion-resistant and high-strength central rope. Due to the excellent selection of materials and process formula, as well as moderate rigidity and flexibility, the filaments are arranged in a three-dimensional and uniformly radiating state, resulting in a suspended three-dimensional elastic filler monomer. The filler can be uniformly stretched and distributed in all directions within the effective area, allowing air, water, and biofilm to be fully mixed and exchanged. The biofilm can not only be uniformly implanted on each filament, maintaining good activity and pore variability, but also obtain a large specific surface area during operation.