h2flow LSRS LevelSmart Water Level Sensor - This Water Level Sensor is for use with the LevelSmartWireless Autofill System. Positioned at the desired water level within the pool, the LevelSmart sensor wirelessly communicates with the LevelSmart valve controller to perform the operation of an automatic valve. The LevelSmart sensor will wake up every 30 minutes, take the current water level measurement, and wirelessly communicate the information to the valve controller. When necessary, the controller will open the valve and fill for 7 minutes. The sensor will continue to check the water level every 30 minutes.