A.T.O. Controller

Automatically refills evaporated aquarium water Maintains aquarium and sump water level to prevent pump damageSave time and effort by automating aquarium top-offsAutomatically refill your sump or aquarium without lifting heavy buckets or spilling water. Floating sensors monitor water level and activate pump when water level drops due to evaporation. Helps maintain stable salinity/specific gravity and optimum water level to prevent pump from running dry. Features LED panel, Audible Signal alert and linkable brackets for installation. Requires water pump, sold separately.Pump Safety Protection: The A.T.O. Controller automatically stops power to your top off pump in the event that your reservoir is low on water. The safety feature prevents pumps from running dry and failing.Please click on "More Information" for additional features and usage guide, and "Other Views" for diagrams of alternate set-ups.