1. Imitation of plant fiber, small water absorption resistance, strong water permeability, effective filtering of dirt, allowing clean water to penetrate to the bottom. 2. Moderate pore density fiber can effectively decompose impurities in the water, reduce fish mortality, and protect water quality. 3. High density and moderate thickness can effectively filter residues, suspended impurities, silt and other large particles in the water for secondary filtration. Nitrifying bacteria can effectively decompose impurities in the water and purify the water quality of the fish tank. 4. It can be used for top filters, built-in filters, waterfall filters, fresh water, salt water and other equipment. 5. It adopts hollow polyester fiber quality, which is soft, has strong water filtration ability, is easy to clean, and can be used repeatedly.