The Niveaumat SP 3000 will automatically top off evaporated water in fresh and salt water aquariums. It comprises an Aqua Medic SP3000 Dosing Pump with a directly connected float switch. The float switch is installed in the aquarium or filter tank at the desired level using its holding unit. As the level drops the SP 3000 automatically tops off the tank with water from a reservoir (reservoir not supplied).