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This hang-on-back filter is for fresh and salt water aquariums. Features an easily-removable motor rack for simple, tool-free cleaning. The direct link with the filter outflow allows for an immediate mix of liquids in aquarium water. Includes a flow control knob.Available for 20 gallon, 30 gallon & 55 gallon tanks.Smart Filter Cartridge available in packs of 3, 6 and 12 cartridges.