The Whisper 20 provides mechanical,
chemical and biological filtration for both freshwater and saltwater aquariums.
Includes 4 1/2" main tube with magnet impeller assembly, 3 3/4" strainer and one
Bio-Bag. The Bio-Bags are constructed of dual-mesh and ultra activated carbon.
The Bio Bags performs mechanical filtration by catching large debris in its
dual-sided mesh. The activated carbon inside the Bio Bag absorbs odor and
discoloration performing chemical filtration. In addition to catching large
debris the dual-sided mesh provides a perfect surface area for bacteria to grow
allowing biological filtration to take place. A flow control knob is positioned
on top of the unit to allow the control of water flow into the filter. The
Whisper 20's motor is 4 watts. Good for aquariums up to 20 gallons.