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Large industrial boilers have extremely strict requirements regarding the salt content in water. The traditional treatment method is ion exchange; however, to ensure effective desalination and water quality stability, reverse osmosis is used in most new projects to produce high-purity water, thereby ensuring the safety and longer service life of the boilers. Due to the extremely small pore sizes of reverse osmosis membranes, excessive accumulation and growth of bacteria on their surface can lead to membrane fouling, thereby affecting the proper operation of the system. Additionally, since reverse osmosis membranes are sensitive to oxidation, an activated carbon adsorption process must be installed before the membranes. The schematic diagram of this process is as follows: (Schematic diagram of the reverse osmosis process) Design parameters: The dosage varies depending on the quality of the water source; it is recommended to use the following amounts: 0.3–0.5 grams per ton for deep well water, 0.4–0.6 grams per ton for tap water, and 1–1.5 grams per ton for surface water. Equipment selection: Since a high pressure of 0.2–0.5 MPa is maintained in the pipes throughout the water treatment process, ordinary equipment is unable to force the disinfectant into these pipes; therefore, HZ series high-pressure direct-supply chlorine dioxide generators must be used.