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Originally Posted by hi_im_god
i'm not familiar with the particular system used in hawaii but at a guess, i'd say what they're watering with is the condensation from the outside of the copper pipes, not the seawater on the inside.
it would be nice if you could freshen water just by running it through copper. but you can't.
and the reason desalinization plants aren't common is because they require huge amounts of energy. in california, it's cheaper to import water from hundreds of miles away then desalinate the ocean next door. as soon as desalinization makes economic sense, it'll happen. the technology isn't new.
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Perhaps I wasnt clear , no they are not watering with the water on the inside of the pipes , but it is very cold sea water that is running through the pipes and when condensation happens it makes the water fresh.
Heres a link to their site , Im sure the people at the lab can explain how they are turning sea water into fresh water better than I can.
http://www.nelha.org/