1. Super aquarium filter media. 2. Use environmental sponge as filter media. 3. Have good effect in cleaning the water. 4. Aquarium sponge filter for item xy-2835, sponge filter with an airlift system, super biochemical sponge filter feature silent operation, and has an excellent filtering effect 5. while oxygenating the water, the social developed foam materials supports the colonization of bacteria, allowing for mechanical filtration in addition to biological filtration, which will break down harmful waste, ammonia and nitrite material, resulting in a cleaner living environment for your fish, particular they are useful for as breeding filter or as secondary filter.