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- In 1748, French researchers used pig gall bladders as semipermeable membranes (membranes).
- In 1861, Graham discovered the phenomenon of osmosis and began to develop it
- In 1906, Bachhold invented a very fine filter membrane with a diameter of 0.01 cm.
- In 1950, Dr. S. Surirajan invented “Biological Osmotic Membrane Simulation”, Reverse Osmosis Foundation (UCLA)
- In 1953, the beginning of research in the field of reverse osmosis process
- In 1960, Loeb and Suriraja were the first to produce RO membranes with acetic acid fibers that had high water flux (WF) and high salt removal (SR).
- In 1970, Filmtek invented RO membranes with low pressure performance.