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1. Raw water quality Water pollution generally falls into two categories: inorganic pollution and organic pollution. Inorganic pollutants include flocculent particles, crystals, etc. Organic pollutants are mostly organic polymers and microorganisms. The filter elements should be combined organically based on the water quality in each area. If the pollutant is dark in color, deep yellow in hue and has an odor, it indicates severe organic pollution; in such cases, pre-treatment methods such as PP filters should be used more extensively. If the pollutant is a white crystalline substance, an insoluble salt, it is an inorganic pollutant. At this point, it is necessary to consider replacing the reverse osmosis membrane with one that has a lower water flux, or increasing the flow rate of the flow control valve, in order to reduce the water concentration flowing over the membrane surface and prevent the formation of crystals. 2. Pre-treatment filter element: If the filtration accuracy of the pre-treatment filter element or the material used for it does not meet the required standards, it will be unable to effectively remove large particle impurities, colloids, suspended solids, and organic pollutants from the raw water. This will lead to a decline in the quality of the water fed to the membrane, an increase in the filtration pressure on the reverse osmosis membrane, rapid clogging of the membrane, and an increase in TDS levels. 3. Wastewater valves The quality of wastewater valves has a direct impact on the recovery rate of reverse osmosis; currently, the wastewater valves in question do not meet the required standards. Based on the principle of reverse osmosis membranes, a certain amount of wastewater must be discharged while producing pure water. Therefore, a flow control valve must be connected to the wastewater outlet of the reverse osmosis membrane. The flow rate of this valve is closely related to the flow rate of pure water produced by the membrane. Generally, the ratio of pure water to wastewater is set at 30:70. If the amount of wastewater is too high, it not only results in waste of water resources but also lowers the inlet pressure, thereby reducing the output of pure water. If the amount of wastewater is too low, it increases the water concentration inside the reverse osmosis membrane; once this concentration exceeds the saturated level, inorganic crystals are formed, which can clog the membrane and lead to a decrease in its output capacity in the short term. 4. Check valve Due to manufacturing processes, many check valves suffer from the issue of the internal valve element coming loose, resulting in a lack of capability to prevent water flow in the reverse direction. A failure of this component directly affects the service life of the reverse osmosis membrane. 5. Booster Pump The main function of the booster pump is to overcome osmotic pressure, thereby ensuring the proper progress of the reverse osmosis process. If the pressure is too high or exceeds the pressure threshold that the membrane can withstand, it is likely to damage the ultrafiltration membrane, causing irreversible damage. On the contrary, if the pressure is too low and does not reach the operating pressure required for the reverse osmosis membrane, the water production rate of the membrane will **decrease**. When selecting a booster pump, it is necessary to consider whether the flow rate and pressure of the booster pump match those of the reverse osmosis membrane.