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What kind of control strategy is most often used to pace chlorine (Sodium Hypochlorite) at a Water Treatment Facility or Reservoir? In my limited experience, I've only seen flow-paced or open-loop control (with a "pacing factor") used for this. Could someone use a Residual Chlorine Analyzer with a PID loop controller to pace the speed of a metering pump to maintain a desired Chlorine Residual setpoint?