Water treatment apparatus

A water treatment apparatus, comprising:

• a filtering unit including at least two filters, each configured to filter raw water;
• a storage member including a first chamber and a second chamber, the first chamber configured to store purified water that has been filtered by passing through the filtering unit, and the second chamber configured to store concentrated water having not passed through a reverse osmosis filter of the filtering unit, wherein a volume of the second chamber is reduced when the purified water is supplied to the first chamber and a volume of the first chamber is reduced when the concentrated water is supplied to the second chamber;
• an extracting member configured to supply the purified water to a user;
• an air supply conduit disposed on a flow path connected to the first chamber of the storage member, and configured to supply air to the first chamber of the storage member;
• and
• a flow path conversion valve configured to convert the flow path to allow flow of the purified water into the first chamber or allow discharge of the purified water from the first chamber,
• wherein the purified water moves from the first chamber to the extracting member in response to a pressure in an extraction line supplying the purified water to the extracting member being lower than a set pressure, and the purified water moves into the first chamber in response to the pressure of the extraction line being greater than or equal to the set pressure,
• wherein the purified water is supplied to the first chamber in use, and air is alternatively supplied to the first chamber to empty the second chamber of water,
• wherein, when the concentrated water is supplied to the second chamber, the purified water stored in the first chamber is supplied to the user via the extracting member, and when the purified water is supplied to the first chamber, the concentrated water stored in the second chamber is drained through a drain line, and
• wherein, when air is supplied to the first chamber through the air supply conduit after the purified water stored in the first chamber is discharged through the extracting member, the volume of the first chamber is increased and the volume of the second chamber is reduced as the first chamber is filled with air, and water accommodated in the second chamber is discharged by reducing the volume of the second chamber, thereby emptying the second chamber of water.