Water purifier

A water purifier comprising:

• a filter member including an inlet through which raw water is introduced, a first filtration part for filtering the raw water introduced through the inlet to provide first filtered water, a second filtration part for re-filtering the first filtered water to provide second filtered water, a first outlet for outputting the first filtered water, and a second outlet for outputting the second filtered water;
• a raw water storage unit that stores the raw water;
• a flow channel providing a passage through which the raw water, the first filtered water, and the second filtered water flow;
• a valve unit including one or more valve modules that are selectively opened/closed to control the flow of the raw water, the first filtered water, and the second filtered water in the flow channel;
• a sterilization module for sterilizing the first filtered water output from the first outlet and the second filtered water output from the second outlet;
• and
• a controller for controlling the opening/closing of the valve module based on a plurality of flow modes and controlling the sterilization module,
• wherein the plurality of flow modes include a raw water sterilization mode for sterilizing the raw water of the raw water storage unit,
• wherein in the raw water sterilization mode, the controller opens/closes the one or more valve modules such that the raw water discharged from the raw water storage unit flows into the first filtration part through the inlet, and the first filtered water output from the first outlet flows into the raw water storage unit via the sterilization module, and
• wherein the sterilization module sterilizes the first filtered water in the raw water sterilization mode.