Recently, the chemical operators of the WOM Pingshan Project Department found in their daily monitoring that the standardized water production rate and desalination rate of the system for water treatment reverse osmosis have begun to decline slowly, and after combining a series of factors, such as reverse osmosis operation cycle and pressure difference of first and second operation, the chemical specialty immediately organizes professionals to carry out chemical on-line cleaning of reverse osmosis. The online cleaning work is strictly carried out in accordance with the operation card. After unremitting efforts of the professionals, the reverse osmosis cleaning of water treatment has been successfully completed, and the water production indicators have been normal, which is laying a solid foundation for unit # 2 startup in the next stage.