CLX Online Residual Chlorine Monitor The CLX is an easy to use chlorine analyzer capable of measuring Free or Total Chlorine. Changing from free to total is easy by changing reagent kits. Can be used to measure Free or Total Chlorine – the onlydifference is the reagents Low reagent use translates into low operating cost of pennies a day Cycle times can vary between 110 seconds and 10 minutes Excellent for oil refineries for the monitoring of sour water