EHEIM LIBERTY offers a simple hang-on filter that you can use right away anywhere. Liberty is merely suspended above the aquarium's glass. Its adjustable inlet pipe allows you to control the aquarium's depth in the water and, consequently, the flow rate. Silently, the filtered water slides back into the tank over water slides. This creates ideal water circulation. The red control knob makes it simple to adjust the pump's output. Three models are available for aquariums up to 200 liters. All are ready to use and include filter media. The advantages of the hang-on filter Some starter sets have a cutout for the hood, but the EHEIM LIBERTY Compact filter is just hung on top of the aquarium glass.