Integrated monitor and control system for continuously monitoring and controlling pH and free halogen in swimming pool water

A swimming pool system having pool water monitored for independent and concomitant control of halogen concentration and pH, comprising, in combination, a swimming pool;

• an integrated monitor and control system for continuously monitoring and independently controlling pH and free halogen in swimming pool water;
• and line connections for circulating swimming pool water flow therebetween;
• the monitor and control system comprising, in combination, a first electrochemical flow cell having two electrodes and through which swimming pool water flows, giving rise to an electric potential between the electrodes in proportion to hydrogen/hydroxyl ion concentration in the pool water;
• means for measuring the electric potential across the electrodes in a manner correlated with pH of the pool water;
• a second electrochemical flow cell having two electrodes and through which swimming pool water flows giving rise to an electric potential between the two electrodes in proportion to the oxidation/reduction potential of the pool water;
• means for measuring the electric potential across the electrodes in a manner correlated with halogen concentration in the pool water;
• a first operational amplifier in electric connection with the first cell and arranged to respond to a pH outside a predetermined range and give a first signal;
• a first means responsive to the first signal to adjust alkali or acid content of the pool water to restore pH to within the predetermined range;
• a second operational amplifier in electric connection with the second cell and arranged to respond to a halogen concentration outside a predetermined range and give a second signal;
• second means responsive to the second signal to adjust halogen concentration in the pool water to restore halogen concentration to within the predetermined range;
• and means for circulating pool water to, through and from each electrochemical cell and to and from a swimming pool water supply.