Hayward AQL-CHEM3-120 pH Dispense Muriatic Acid Feed System, 120-volt 120-Volt pH dispense muriatic acid feed system Compatible with all Gold line Aqua Rite Pro and Pro Logic pool controls using an AQL-CHEM sense and dispense system It automatically enabled to dispense muriatic acid into the pool until the pH reaches the desired level Kit includes Steiner S1G45MJL3F2S/W2S series acid pump and 15-gallon tank, 1 flow indicator, 2 injector valves, 1 hose clamp and 1 AQL-CHEM-3 manual Check valve to protect pool equipment from backflow of acid