Pump aeration towers are mainly used to stir the water column of the lake. They mainly use the principle of the transport of oxygenated water that is beneath the surface, to layers without oxygen that are near the bottom.
Aeration towers with an aerator are mainly used to oxygenate the water column. Air is supplied to the aerator that is installed over the bottom. In the aerator, the air is mixed with water and this mixture of air and water is distributed via the aerator nozzles to the surrounding oxygen-free environment.