Tetra Whisper Power Filter for Aquariums - PF-20 (10-20 Gallon Aquariums)

PF-20 (10-20 Gallon Aquariums)Tetra Whisper Power Filters are the best-selling brand of power filters in the U.S. Appropriate for every size aquarium, they provide the three types of filtration that your aquarium needs: Mechanical Filtration - Removes uneaten food, bits of plants and fish waste Biological Filtration - Provides for growth of a colony of beneficial bacteria that will eliminate harmful toxins in the water Chemical Filtration - Activated carbon removes compounds that cause odors and discoloration of the water| The Tetra Whisper Power Filter contains a hinged lid for improved ergonomics / ease of use, an improved compact aesthetic design, time strip indicators, a convenient top-mounted flow control dial and packaging upgrade. Hang on back HOB power filter for easy installation.Designed for ease of use, Whisper Power Filters use Bio-Bag filter cartridges for mechanical and chemical filtration. The disposable Bio-Bags remove waste particles, discoloration and odors from aquar