The biochemical filter cotton is a mesh structure of the main skeleton formed by a large polyurethane foam through opening and removing the membrane. This kind of biochemical cotton has good air permeability and cultivates biochemical bacteria, so as a filter material, it has low flow resistance and high filtration efficiency. specialty. It can be washed repeatedly with water, showing the advantages of durability, economy, and environmental protection. It is mainly used in aquarium filters, fish pond filtration, koi fish pond filtration, engineering filtration, sewage treatment, air purification, etc. It can be cut into various sizes according to customer requirements.