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"The membrane lets the freshwater force its way through to the enclosed saltwater side, where pressure builds, pushing water through a pipe to drive a turbine."

Read more: http://www.time.com/time/magazine/article/0,9171,2034515,00.html#ixzz183P8cO8f

Thanks, very interesting. Also, you may want to take a look at this too:

http://www.cleanmpg.com/forums/showthread.php?t=36680