Tetra Whisper Internal Power Filter – 20i (20 Gallons)


SKU: WL25817 Categories: ,


20i (20 Gallons)

Tetra Whisper In-Tank Power Filters provide the ultimate in convenience and quiet. These filters mount on the inside of the aquarium, rather than hanging from the outside — making it possible to place the tank flush against a wall.

  • Motor is under the water for extremely little noise
  • Functions in as little as 2 inches of water
  • Includes one pre-assembled Whisper Bio-Bag filter cartridge

In-Tank Filters are unusually quiet, since the motor is under the water. Offering the same quality and performance as an external filter, the Whisper In-Tank Filter will function in as little as 2 inches of water — making it ideal for turtle tanks, or for creating a waterfall inside the tank.

Whisper In-Tank filters adjust easily to high or low water levels with mounting suction cups and/or clip. Each filter includes one pre-assembled Whisper Bio-Bag filter cartridge and mounting clip.


  • 4i: Aquariums up to 4 Gallons, 24 GPH, Use S Cartridge.
  • 10i: Aquariums up to 10 Gallons, 90 GPH, Medium Bio-Bag. 4.2″L x 4″W x 8″H
  • 20i: Aquariums up to 20 Gallons, 125 GPH, Large Bio-Bag. 4.9″L x 5.4″W x 10.2″H
  • 40i: Aquariums up to 40 Gallons, 170 GPH, Large Bio-Bag. 5.1″L x 5.9″W x 10.5″H