Introduction to maintenance methods for ultra-pure water equipment when it is not in use for extended periods

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　　1. In the event of a short-term shutdown of the RO system (not exceeding three days), it is necessary to flush the system with a safety filter for 30 minutes each day, ensuring that the RO components are filled with filtered water. 　　2. If the RO unit is shut down for an extended period (more than three days), a 1% formalin solution should be used to fill the RO components; all valves must then be closed, and the system should be inspected once a month. In summer, control the environmental temperature to prevent mold; in winter, protect against freezing, and 10-20% glycerin can be added if necessary. 　　3. It is best to use reverse-osmosis freshwater for storage water, and chemical reagents should be used for formaldehyde. 　　4. When a reverse osmosis system composed of composite membranes is to be out of use for more than a week, the system should be soaked in a 1% NaHSO3 solution to prevent bacteria from multiplying on the membrane surface.