New Aquarium Biochemical Small-Sized Sponge Filter Percolator XY-2835 Features: With an system, super biochemical sponge filter features silent operation, and has an excellent filtering effect while oxygenating the water. The special developed foam materials support the colonization of growth. It allow for mechanical filter in addition to biological filtration, which will break down harmful waste, ammonia and nitrite material. It result in a cleaner living environment for fish, particular they are useful for as breeding filter or as secondary filter. Supplying the water much needed oxygen.It reduces noise from air pump and consumes lowest wattage. Most fit to external or top filter as prefitration unit. No deads spots in cylinder foam offers increased filration. Easy maintainence is made by nodular design of foam cartridge system. Provides biological filtration to the aquarium, helps to stable water quality. Increase the oxygen solubility Working noiselessly. Good permeability, easy to clean. Adhere smooth surface with suction cup Size: 12cm x 5.5cm x 5.5cm. Fit for 10cm ~ 80cm deep fish tank Package included:1x Aquarium biochemical Sponge Filter