You simply suspend Liberty at the top of the aquarium glass. With the help of the height-adjustable suction hose you determine the immersion depth and thus the stirring behavior in the aquarium. The cleaned water is returned silently to the tank. This way you have a perfect circulation of the water. The flow rate of the pump is easily adjustable with the red button. 3 models are available for aquariums up to 200 liters volume. All of them are complete, including filter masses and immediately ready for use.