The Regal Smartvalve from Chlorinators Incorporated helps operators apply the exact chlorine dose needed to accommodate changes in water flow and quality. It can be used with a gas chlorinator to apply residual-only control or compound loop control schemes. A chlorine residual analyzer measures the chlorine level and provides feedback to the Smartvalve, which then compares the measured chlorine residual to the desired residual and, if necessary, adjusts to the chlorine gas feed rate. 772/288-4854; www.regalchlorinators.com.