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This post was last edited by hesonchang214 on 2020-4-14 at 13:43. 1. Short-term shutdown of the system (1–3 days): Before shutting it down, the system is first flushed with low pressure (0.2–0.4 MPa) and at a high flow rate (approximately equal to the system’s water production rate), for a duration of 14–16 minutes; then the normal natural water flow is allowed to carry water into the concentrated water channel. 2. When the system is out of service for more than a week (with an ambient temperature above 5°C): Before shutting down the system, apply low pressure (0.2–0.4 MPa) and a high flow rate (approximately equal to the system’s water production rate) for 14–16 minutes as a rinse. Carry out chemical cleaning in accordance with the methods specified in the reverse osmosis system’s operating instructions. After the chemical cleaning is complete, rinse the reverse osmosis membranes thoroughly. Prepare a 0.5% formalin solution and introduce it into the system under low pressure, allowing it to circulate for 10 minutes. Then close all valves in the system to seal it up. If the system remains out of service for more than 10 days, the formalin solution must be replaced every 10 days. 3. When the ambient temperature is below 5°C: Before shutting down the system, it should first be flushed under low pressure (0.2–0.4 MPa) with a high flow rate (approximately equal to the system’s water production rate) for 14–16 minutes. Where conditions permit, the ambient temperature can be raised above 5°C, after which the system can be maintained following method 1. If it is not possible to raise the ambient temperature, then water at low pressure (0.1 MPa) and at a flow rate of 1/3 of the system’s water production rate should be used to keep the system running continuously, in order to prevent the reverse osmosis membranes from being damaged by freezing. The system should also be operated for 2 hours per day. After cleaning the reverse osmosis membranes using methods (2) and (3) from method 1, these membranes should be removed and placed in an environment where the temperature is above 5°C, immersed in a 0.5% formalin solution. The membranes should be turned over every two days. The water in the system’s pipes should be drained completely to avoid damage caused by freezing.