The Shark ADV is an exclusively designed internal filter with a patented quick uncoupling system (MCS System). Equipped with a venturi system for improved oxygenation. The modular design allows Fast and easy maintenance and a perfect seal of the filtering bodies with the pump. Features Revolving pump head for directional water flow 210 cubic cm modular cartridge for extra filtration For fresh and salt water aquariums Extra-strong suction cups Shark ADV 400 - 106gph - 16 - 34 gallons Shark ADV 600 - 158gph - 26 - 47 gallons Shark ADV 800 to 211gph - 34.5 - 65 gallons