For every two gallons of water the plant takes in, its reverse osmosis process will make one gallon of fresh water and send back to the ocean one gallon with twice the salinity level.

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As every schoolchild should know, water moves from a dilute to a concentrated solution through a semipermeable membrane by a process called osmosis.

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But when you disappear into the great anonymity of a big city like London, what you find is that you then resurface and you've actually, by some process of osmosis, brought yourself into company with like minds.

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That's a big improvement from the 1970s, when Sidney Loeb at the University of California, Los Angeles, was working on a process to desalinate water and came up with the idea of using osmosis to generate power.

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