Jardin Aquarium Fish Tank Biochemical Sponge Filter, 4-1/2-Inch
Biochemical Sponge Filter provides both mechanical and biological filtration. Simply install an airline into the unit and provide both aeration and filtration for your fish. Aerobic bacteria colonize the sponge providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the 4 1/2 Inch Sponge Filter traps waste particles mechanically cleaning the water without trapping the baby fish. The Fish Tank Sponge Filter featuring a weighted plastic base that keeps the unit from floating during use, and cylinder design to eliminate dead space between the filter. Lift tube allows the use of power head without adapter, increasing its versatility.