The aquaniveau electronic level controller may be used in 2 different modes: As a top up controller with one or two float switches to control the replacement of evaporated water. It is possible to control dosing pumps (e.g. SP 3000) or circulation pumps (max. 200 W). If circulation pumps shall be controlled, a second sensor can be used as dry running protection for the pump. In order to fill a storage tank by an osmosis unit, the operation with solenoid valve and two float switches as maximum/minimum control is possible