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This post was last edited by hesonchang214 on 2020-4-21 09:18. The reverse osmosis membrane separates substances from water based on the fact that other substances cannot pass through this semipermeable membrane. Due to the extremely small pore size of the reverse osmosis membrane (around 10 Å), it is capable of effectively removing dissolved salts, colloids, microorganisms, organic substances, etc. from water (with a removal rate of up to 97%-98%). There is no standard answer to the question of how often the reverse osmosis membranes in integrated circuit cleaning ultrapure water treatment equipment need to be replaced. Under normal circumstances, the RO membranes in polysilicon ultrapure water treatment systems are generally replaced every 1–2 years. However, the specific timing also depends on the quality of the water produced. As long as the quality of the water generated by the polysilicon ultrapure water treatment system meets the required standards within its specified service life, there is no need to replace the membranes; but if the water quality deteriorates, the reverse osmosis membranes must be replaced immediately. The main reason is that the service life of the RO membrane (the time required for replacement) is uncertain and can vary depending on the quality of the water fed into the RO reverse osmosis system. Generally, when the quality of the incoming water meets the requirements, that is, when the pre-treatment of the water results in ultra-pure water, then the RO membrane can reach its specified service life. If the fluctuations in pre-treatment are significant and the quality of water entering the RO reverse osmosis system deteriorates, it will severely affect the performance and service life of the RO membrane, which in turn impacts the quality of the water produced. In such cases, it is necessary to replace the RO membrane immediately.