United States bought this(The Auto Top Off unit ATO is designed to offer a simple controller to automatically replace evaporated water from a sump or aquarium. Utilizing two Level Sensors you can set the minimum level in your sump at which point the ATO controller will activate a water pump not included in your reservoir/holding tank. Once the desire level is reached the sensor will turn off the water pump. You can also place the second Level Sensor in the reservoir to turn off the water pump if the water level gets too low and threatens to burn out the pump. Alternatively you can set a minimum and maximum level in your sump using both Level Sensors to control the top off water pump. Simple to follow instructions and several hanging bracket options make this unit very user friendly and offers a hands-free top method for your aquarium.
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