Profile: Hydro Instruments manufactures gas chlorinators, gas chlorination systems and chemical metering equipment. We produce vacuum feed equipment for a variety of liquid chemical solutions. Our GA-170 gas leak detector features two common plus two adjustable per sensor, latching/non-latching and failsafe/non-failsafe outputs & backlit LCD display-2 line and 16 characters per line. We offer liquid chemical feed system, which is a system for feeding a variety of liquid chemical solutions that includes sodium hypochlorite.