Hydor Smart Level Controller, Automatic Top Off, ATO

The Smart Level is a versatile fully electronic water level controller designed by Hydor. Smart Level safely and easily handles your choice of aquarium or sump water level due to evaporation. Designed to be used in the many different conditions that exist in marine and freshwater aquarium environments. With no moving parts, Smart Level technology reduces the problems related to lime scale deposits, bacterial film, and wave action, which ensures the continuous, safe, and regular functioning of the Smart Level Control.