UNIVERSAL DESIGN: Tetra Whisper 20i Internal Filter is an all-in-one air pump and water filter system.

INTERNAL FILTER: Mounts on the inside of your aquarium with clip (included).

CATCHES DEBRIS: Dense, dual-sided mesh filters debris and fish waste.

AERATES WATER: Air-driven design filters up to 125 GPH while oxygenating water.

CONVENIENT DESIGN: Uses large easy to change Bio-Bag cartridges; filter mounts inside aquarium, making it possible to place tank flush against the wall.