Key features

• •Provide both mechanical and biological filtration. This filter comes with two media containers with ceramic ball inside to accommodate bacteria necessary for biological balance and to remove toxic ammonia and nitrite. You can also replace this ceramic media with other media like carbon, ammonia absorbers, etc.
• •Simply install an airline into the unit and provide both aeration and filtration for your fish (Air pump sold separately). Aerobic bacteria colonize the sponge providing a bacterial substance to facilitate the nitrogen cycle.
• •The sponge traps larger waste particles mechanically cleaning the water without trapping baby fish. The porous ceramic material is an ideal home for the cycle bacteria to colonize.
• •Product dimensions: 4.5"W x 7.5"H; sponge and ceramic compartment dimensions: 1.75"D x 4.75"H. They are useful for as breeding filter or as secondary filter. Or they can be used as pre-filtration unit by fitting to an external or a top filter.
• •Max tank size up to 50 gallon. Package includes: 1 set of Sponge filter, 2 bags of small ceramic balls.