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When the desalination efficiency and water production volume of the reverse osmosis system in a pure water production unit start to decline, it indicates that the system is not operating stably and is beginning to develop faults; this is one of the common problems encountered with the reverse osmosis systems in such units. This may be caused by dirt or scale, and appropriate cleaning can be carried out. If the desalination rate and water production volume decrease suddenly, and by a significant amount, it may be caused by improper operation. If a problem occurs, it needs to be resolved quickly to avoid missing the optimal time for repairs. There are many reasons why the reverse osmosis system in ultra-pure water equipment causes this fault; it is necessary to conduct analysis and troubleshooting to ultimately resolve the issue. Main troubleshooting measures: First, check the instruments to see if they are being operated correctly. Second, recheck the operation data to see if there are any omissions or improper operations. Third, it is necessary to determine whether it is a mechanical issue or a fault caused by chemical factors. Fourth, it is necessary to analyze whether the failure was caused by a reaction resulting from the chemical feed water. Identify the fifth pair of pollutants to find the cause. When using the reverse osmosis system in ultra-pure water equipment, the following points should be taken into account. Under no circumstances should water containing free chlorine come into contact with the composite membrane elements; such contact will lead to a decline in the performance of these membrane elements, with no possibility of restoring their original performance. After disinfecting the pipelines or equipment, it is necessary to ensure that there is no free chlorine present in the water supplied to the reverse osmosis membrane elements. When it is not possible to determine whether there is free chlorine, it should be verified through testing. Sodium bisulfite solution should be used to neutralize residual chlorine, and sufficient contact time must be ensured to guarantee complete reaction.