US Patent 7150817 Water treatment-apparatus using ion having drain hole

Disclosed is a water treatment apparatus capable of purifying water by means of ionization and activation of the water passing through tubular objects under an electric field and cleansing the interior of the tubular objects through which the water passes. The water treatment apparatus of the invention is preferably uses ions, and has a metal casing provided with at least one drain hole for naturally discharging condensed water, which is generated and accumulated between the metal casing and a housing, to the outside.