Patent ID: 8182656

Claim:
An electrolyzing device comprising: first and second main electrodes; an auxiliary electrode; and control means including switches for controlling current supply to the electrodes, wherein: the first main electrode is an electrode having a property that the electrode deteriorates when used as a cathode, the electrolyzing device is configured to operate in an electrolyzing mode in which treated water is electrochemically treated, a scale removal mode of the second main electrode in which scales adhered to the second main electrode are removed and a scale removal mode of the auxiliary electrode in which scales adhered to the auxiliary electrode are removed, the control means is configured: in the electrolyzing mode, to control the switches to apply a positive potential to the first main electrode to act as an anode and a negative potential to the second main electrode to act as a cathode; in the scale removal mode of the second main electrode, to control the switches to apply a positive potential to the second main electrode to act as an anode and a negative potential to the auxiliary electrode to act as a cathode; and in the scale removal mode of the auxiliary electrode, to control the switches to apply a positive potential to the auxiliary electrode to act as an anode and a negative potential to the second main electrode to act as a cathode, and in the scale removal mode of the second main electrode, the control means further controls the switches to apply a positive potential to the first main electrode to also act as an anode, and controls the electrolyzing device so that an anode current flowing to the first main electrode is smaller than that flowing to the second main electrode.