When the following conditions occur, offline cleaning of heavily polluted RO membrane components must be carried out:

a. The pollution of reverse osmosis membrane components meets the "severe pollution" standard;

b. The reverse osmosis system cannot meet the system's rated value specifications based on online cleaning;

c. The types of reverse osmosis pollution are quite diverse, and online cleaning can easily cause cross contamination; The front-end pollutants of the reverse osmosis system are likely to be carried to the rear of the system through online cleaning, and the membrane components in the latter half of the system will be contaminated, which is called cross contamination;

d. The reverse osmosis system continues to generate pollution after several cleaning cycles.

e. The reverse osmosis sewage treatment system is unable to carry out online cleaning or lacks online cleaning machinery and equipment due to power supply anxiety and instability;

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