Got to look up how pressure is needed for the "reverse osmosis".
STOP this verbal diarhoea.
Go and think in private, then come back with a well-formed answer. Stop wasting pages and pages of back-of the-envelope calculations based on half-assed guesses about things you don't even know about.
the information is readily available. you have an internet connection, now go and do your homework, you naughty little boy...