Abstract: In controlling a sterile water production device, if pH of sterile water is smaller than a preset pH, an additional aqueous hypochlorite solution is injected into the sterile water to increase the pH back to the preset pH, and a molar quantity of residual alkaline impurities present in such additional aqueous hypochlorite solution is determined. Next, a predetermined amount of further additional aqueous hypochlorite solution is injected into the sterile water, wherein such predetermined amount is an amount required to yield additional content of hypochlorous acid in a resulting sterile water, to such a degree that a molar quantity of that hypochlorous acid is equal to the foregoing determined molar quantity of residual alkaline impurities. After such injection, pH of sterile water yielded is increased, and an acid aqueous solution is then injected into the sterile water to thereby decrease the increased pH back to the preset pH.

Abstract: The liquid mixing device has an operative mixing unit having an inside which is substantially hollow; and an injection unit provided in the inside of the operative mixing unit. The injection unit is adapted for allowing a second liquid to be injected into the inside of the operative mixing unit, and the operative mixing unit is provided with: an inlet port for allowing a first liquid to flow thereinto; and an outlet port. The injection unit is provided with an injector element of a tubular form which has: an injection hole(s) so perforated therein as to face toward the outlet port; and an opening region defined therein so as to allow the first liquid to pass rectilinearly therethrough in a direction from the inlet port toward the outlet port. The injector element may be of a generally ringed shape or of a generally “U” shape.

Abstract: In controlling a sterile water production device, if pH of sterile water is smaller than a preset pH, an additional aqueous hypochlorite solution is injected into the sterile water to increase the pH back to the preset pH, and a molar quantity of residual alkaline impurities present in such additional aqueous hypochlorite solution is determined. Next, a predetermined amount of further additional aqueous hypochlorite solution is injected into the sterile water, wherein such predetermined amount is an amount required to yield additional content of hypochlorous acid in a resulting sterile water, to such a degree that a molar quantity of that hypochlorous acid is equal to the foregoing determined molar quantity of residual alkaline impurities. After such injection, pH of sterile water yielded is increased, and an acid aqueous solution is then injected into the sterile water to thereby decrease the increased pH back to the preset pH.