ELC-800r Water Level Controller for single sensing surge tank, used for bodies of water with overflow gutters. AquatiControl’s ELC-800r Water Level Controller is accurate and reliable in controlling water to precise levels in swimming pools, spas, fountains and water features. The ELC-800r features accurate functionality and easy to program menu system. It has the ability to sense dangerously low water conditions and deactivate circulation pumps, protecting them from damage. Using proximity sensing technology, the ELC-800r stands apart from other water level controllers that use floats, or introduce electrical currents into the water. The surge tank allows mounting in a surge tank to control pool and spa levels. 25-feet cord. Additional cord length available upon request for additional cost.