After understanding the relationship between the standard desalination rate of reverse osmosis membrane elements, the actual desalination rate of reverse osmosis membranes, and the desalination rate of the reverse osmosis system, it is crucial to base the design of reverse osmosis systems, provide system performance guarantees to users, accept reverse osmosis systems, or evaluate membrane element performance on the actual desalination rate of the system, not the standard desalination rate of the membrane elements.
The desalination rate of the reverse osmosis system is the desalination rate exhibited by the entire reverse osmosis system. However, due to differences in operating conditions and standard conditions, the system desalination rate differs from the standard desalination rate. Furthermore, since reverse osmosis systems typically involve multiple membrane elements connected in series, and the actual operating conditions of each membrane element vary, the system desalination rate also differs from the actual desalination rate of the membrane element. Only for systems with only one membrane element does the system desalination rate equal the actual desalination rate of the membrane element.