This upgraded version of the aquarium sponge filter utilizes an airlift system for silent operation and outstanding filtering performance while oxygenating the water. The specially developed foam material supports bacterial colonization, while the strategically placed upgraded ceramic filter media in the middle of the sponge filter allows for biological filtration in addition to mechanical filtration, breaking down harmful waste such as ammonia and nitrite materials. This results in a cleaner and healthier living environment for your fish. It is particularly useful for breeding or as a secondary filter.