The elastic filling screens are made from several types of polyolefins and polyamides that are resistant to corrosion, temperature, and aging. Mixed with hydrophilic, adsorption, and heat-resistant auxiliaries, they utilize a special spinning and yarn-making process, intertwining the yarns with a durable, high-strength central rope. Due to the refined material selection and process formulation, the yarns are arranged in a three-dimensional, even radiating pattern, forming the individual units of suspended three-dimensional elastic filling. The filling can uniformly expand and cover the effective area, allowing for full mixing and contact exchange of gas, water, and biofilm. The biofilm can not only evenly settle on each yarn, maintaining good activity and porosity variability, but also achieve a large specific surface area during operation.