... USP, China Pharmacopoeia. water treatment equipmentSummarize: Reverse Osmosis is the opposite process of the natural permeation. It is caused ... . If the applied pressure is bigger than the natural osmosis pressure, the solution will pass through semi ... . If the applied pressure is smaller than the natural osmosis pressure of solution, the solution will flow ... , SAT, DQ, IQ, OQ, PQ ect. RO water purifier