Hayward AQL-CHEM pH/ORP Sense and ORP Dispense Chemistry Kit 1 PH and ORP sense and ORP dispense chemistry kit 1 Compatible with all Hayward Aqua Rite Pro and Pro Logic pool controls Comes with two pigtails for connection to a pH reducing device like a peristaltic pump or solenoid valve that requires a line cord receptacle Eliminates additional installation costs and provides a single source for status reporting and control It uses a proportional feed algorithm that continuously tests the water, sampling pH and chlorine levels and adjusting chemical feeding