Abstract: A method of treating water comprises pausing sample water through an anode compartment of an electrochemical cell, or of an electrochemical cell stage. The anode compartment is separated from a cathode compartment by a water-impermeable membrane capable of transferring positively charged ions or cations only. At the same time, a direct electric current is applied between electrodes in the anode and cathode compartments, and a demineralized water stream is passed through the cathode compartment. Cations of dissolved salts in the sample water pass or migrate across the membrane. Water also dissociates in the anode compartment to generate hydrogen ions, and these hydrogen ions associate with the anions of the dissolved salts, to form the corresponding acids of the dissolved salts.