Abstract: An ozone water producing apparatus comprises: a gas-liquid mixing vessel having a water-discharging port near the bottom and a gas-discharging port at an upper portion; an inner vessel inside the gas-liquid mixing vessel, having an upper opening positioned lower than the gas-discharging port; a main conduit having one end extending into the gas-liquid mixing vessel and opening at a lower portion inside the inner vessel, and having an end connected to a pressure source of water via a water-supplying valve; a gas-induction conduit having one end connecting to the main conduit, and having an end connected to a gas-induction valve; a gas-discharging conduit having one end connected to the gas-discharging port, and having an end connected to a gas-discharging valve; a communicating conduit connecting the gas-induction valve and the gas-discharging valve; an ozone generator connected to the communicating conduit; and an ozone-decomposing catalyst vessel connected to the communicating conduit.

Abstract: Service water is filtered by an active carbon pre-filter. The pre-filtered water is forced into a reverse osmosis membrane by a pump to produce pure water, and the pure water is processed to remove specific substances that consume ozone. Then, an ion-exchange resin treats a part of the low-ozone-consuming water and removes electrolytes from it to produce proper ultrapure water, which is supplied through a gas-liquid separating vessel to an electrolysis cell to produce ozone-containing gas. Another portion of the liquid in a lower space in the vessel is sent through a line to a separate temperature-controlled container. The returned liquid is mixed with the gas from the electrolysis cell by using an aspirator and ejector. Part of the high-concentration ozone water can be supplied through the temperature controlled container, a solenoid valve and a needle valve to an ozone water discharge device.