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1. During nighttime shutdowns, tap water used as raw water can be utilized to backwash the quartz sand filter and activated carbon filter. Because of the certain pressure in the tap water, it can still flow into the sand filter and carbon filter through the pump body and return valve. 2. Based on the quality of the raw water and the operating conditions of the equipment, it is possible to set the operation cycle and duration of the fully automatic water softener according to the user’s needs. 3. The quartz sand or activated carbon in the sand filter or carbon filter should be thoroughly cleaned and replaced every year or every six months, as recommended. 4. For the fine filter, drain the water once a week. The PP filter element inside the fine filter should be cleaned every 1 to 3 months: the outer casing can be removed, the filter element taken out, rinsed thoroughly with water, and then reinstalled. It is recommended to replace it every six months or so. 5. If the water production rate decreases by 15% not due to temperature and pressure factors, or if the water quality deteriorates beyond acceptable levels, it indicates that the reverse osmosis membrane requires chemical cleaning. 6. During the operation of the ultrapure water system, various faults may occur occasionally for different reasons. Once a fault appears, it is necessary to carefully examine the operation records to analyze its cause.