The Hydro-Sponge III Filter provides both mechanical and biological filtration for aquariums up to 30 gallons. Aerobic bacteria colonize the sponge, providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the Hydro-Sponge traps large waste particles, mechanically cleaning the water. The Hydro-Sponge filters are designed for stackablility to increase the filtering capacity.

Instructions:
Rinse and squeeze the sponge under water and slip the sponge on the strainer. Directions for use with a airstone: Connect airstone to the bottom of the bull's eye, then connect bull's eye to the top of the strainer. A pump, airline tubing, and airstone are needed. Directions for use with a power head: Attach the power head to the lift tube.

Maintenance:
Rinse the sponge with cool, running water weekly. Do not use hot or cold water as this will destroy the bacteria which colonize the sponge. Do not use soap or detergent when rinsing the sponge.