Patent ID: 8007575

Claim:
An air filtering apparatus for electrolyzing water to generate electrolytic water containing active oxygen specifies and filtering air by using the electrolytic water, comprising: an electrolytic tank for generating electrolytic water; a gas-liquid contact member to which electrolytic water from the electrolytic tank is supplied to bring air into contact with the electrolytic water, thereby filtering the air; a water receiving tray that has a water receiving unit for receiving used electrolytic water discharged from the gas-liquid contact member and a water stock unit which is joined with the water receiving unit, the water stock unit having a deeper bottom than the water receiving unit to stock the used electrolytic water discharged from the gas-liquid contact member; a circulating pump for circulating the electrolytic water stocked in the water stock unit to the electrolytic tank; an electrical conductivity detecting unit for detecting the electrical conductivity of the circulated electrolytic water; a drain pipe that is connected to the water stock unit and discharge the electrolytic water stocked in the water stock unit to the external; a drain valve that is connected to the drain pipe and discharges the electrolytic water stocked in the water stock unit from the drain pipe to the external by an opening/closing operation thereof; and a controller for controlling the opening/closing operation of the drain valve and opening the drain valve when the electrical conductivity detected by the electrical conductivity detecting unit is out of a predetermined range, thereby discharging the electrolytic water stocked in the water stock unit to the external.