Hydro-Sponge 3 Filter
The Hydro-Sponge filter provides both Mechanical and biological filtration. Aerobic bacteria colonize the sponge, providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the Hydro sponge traps larger waste particles, mechanically cleaning the water. All Hydro-Sponge filters are designed for stack-ability to increase the filtering capacity. Very easy to clean, just rinse and squeeze!