11.8 liters. According to the size of the water purifier and the water output required by the water purifier per hour, if the water output of the 75g water purifier is 11.8 liters per hour, the water output of the water purifier in the restaurant needs 11.8 liters per hour. Water purifier, also known as water purifier and water purifier, is a water treatment equipment for deep filtration and purification of water quality according to the requirements of water use.