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You may like to have a look at the following link to the International Desalination Website. The site provides several fact sheets on membrane technology and desalination.

I would like to repeat the first piece of advice that was ever given to me with regards to RO plants. It was along the lines of "Remember that RO membranes are only for reducing the level of dissolved salts in the water. They are not for filtering out particles, so ensure that before the water reaches the RO membranes it has been cleaned to a high degree. If not, you will degrade the very expensive membranes rather quickly." Unfortunately a lot of water engineers have learnt that lesson the hard way.

https://www.amtaorg.com/publications-communications/membrane-technology-fact-sheets-summary