The Tetra Whisper 10i Internal Filter for aquariums is the ultimate in quiet convenient 3-stage filtration. The air pump (included) provides bubbles that move water through the filter efficiently filtering and oxygenating your aquarium. The water flows through Ultra-Activated carbon absorbing s and discoloration as well as through the dual-sided mesh of the Bio-Bag Filter trapping debris and fish waste. Filters up to 80 GPH while oxygenating water. The Tetra Whisper 10i Internal Filter adjusts easily to high or low water levels with a mounting clip.