Regarding to two-stage reverse osmosis, we could simply consider it as two sets of one-stage reverse osmosis system, the two are connected in series.
in order to get high quality pure water to meet our requirement and standard, sometimes the water quality of one-stage Reverse Osmosis system is not pure enough, we will use the output water of one-stage as the raw water of the second-stage reverse osmosis, thereby we will get the final pure water which pass through two times reverse osmosis.
Two factors determine whether we choose one-stage or two-stage...
A) the quality of your raw water.
B) the final water quality you want, or the application field of your final pure water. ( this is the main factor)
For packaged drinking water producing purpose, to meet the water quality standard, we should adopt two-stage reverse osmosis.
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