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This post was last edited by hesonchang214 on 2020-4-21 09:35. There are generally two methods for cleaning ultra-pure water equipment used in the electronics industry: one is the backwash system built into the equipment itself, and the other is to clean the equipment by adding cleaning solutions to it. Under normal circumstances, after being in use for a certain period of time, the surface of the RO membrane in ultra-pure water equipment accumulates substances such as colloids. This type of fouling can generally be removed by using the membrane flushing or backwashing functions built into the equipment. However, in some areas the hardness of the raw water is too high, resulting in the formation of scale. In such cases, it is necessary to add a cleaning solution to the equipment. The common practice is to use low-concentration hydrochloric acid in the cleaning water; if there is a lot of scale, the equipment can be soaked for a short period of time, which will effectively remove the scale. For microorganisms such as bacteria, a low concentration of caustic soda (sodium hydroxide) or an appropriate concentration of hydrochloric acid can be added for cleaning or soaking. If both treatments are required, it is recommended to perform alkali washing first, followed by acid washing. However, when adding hydrochloric acid and washing away alkali, it is essential to pay attention to the concentration; either too high acidity or alkalinity can cause irreversible damage to the RO membrane and shorten its service life. Factors such as the total amount of water produced by the ultra-pure water equipment in the electronics industry, the quality of the raw water, the pre-treatment processes, and the design of the ultra-pure water equipment itself determine the cleaning cycle and the time required for each cleaning session. If we feel that the equipment needs to be cleaned but are not sure how to proceed, it is best to contact the manufacturer for assistance. Following the advice of professionals, the manufacturer can send technicians to carry out the cleaning, thereby ensuring that the ultra-pure water equipment is cleaned without any damage.