The aquarium pump is used submerged or / and sec.On can therefore use aquarium as surface stirring (submerged) or filtration and / or a cooling unit through which it will circulate the water (beware the water flow of the pump is only 800l / h which is a little low for use with a cooling unit) But it can also be used for a water fountain in a closed circuit. In this case it is sufficient for a lift height of 120cm, consumes no electricity and can run continuously for many weeks without interruption.