The Tetra whisper 10i Internal power filter provides three stages of filtration. Mechanical, chemical and biological filtration, helping provide cleaner water for a healthier environment . The 10i power filter is for aquariums 5 to 10 gallons. The ready to use Medium size cartridges make maintenance quick and easy so your tanks water can stay crystal clear. Ideal for low water level environments, easy to conceal and quiet operation powered with an 80 gph motor.