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The LevelSmart Sensor wakes up every 30 minutes to check your water level and wirelessly communicate to the valve controller up to 1000 feet away through RF communication. If it is below your desired level then it will fill for 7 minutes, if it is at your desired level then it will check again in 30 minutes. 

The valve is plumbed into the manual fill line or it is "T"d into the return lines from a water source. The valve controller can then open and close the valve to fill your pool.