Electrolyte producing apparatus with monitoring device

An electrolyte producing apparatus comprising:

• an electrolyzing device having an anode side and a cathode side for producing an acidic liquid on the anode side and an alkaline liquid on the cathode side through electrolyzing a basic liquid;
• a mixing device connected to the electrolyzing device for mixing a part of the acidic liquid produced on the anode side and a part of the alkaline liquid produced on the cathode side, said mixing device having means for regulating amounts of the acidic liquid and the alkaline liquid to form a predetermined ratio of a mixture of the acidic and alkaline liquids such that hypochlorous acid contained in the acidic liquid is substantially completely dissociated into H.sup.+ ion and hypochlorous acid ion in the mixture;
• and
• a measuring device including light ejecting means for ejecting light to the mixture, and light receiving means for receiving the light passing through the mixture to measure a light absorbance of the hypochlorous acid ion in the mixture in an area of wavelengths of about 260 nm to 330 nm.