This is a water purifier (RO membrane Filter) to purify harmful materials such as rust residue, chlorinated ingredients, and heavy metals from contaminated tap water to provide clean drinking water. It provides room-temperature, hot and cold water. The temperature of hot water can be adjusted to three levels with temperatures especially for frequently-used tea, coffee or powdered milk for more convenience. Since it provides clean water, it has a sterilization system to increase its interior cleanliness. The lower faucet tray slides automatically while sterilized water passes through the interior flow channels and faucet to sterilize them.