> How do reverse osmosis pumps work? And what do they cost? I live in South > Africa where anything like this has to be imported and costs a bomb. Since Dave has already explained how do they work, I could tell "how do you work them" :-)... You pump, and pump, and pump. 1 liter per hour for PUR-06 (didn't see them cheaper than $500 new, but got mine for $150 - army write-offs, 6 yrs old). They exist in "military" modification, i.e. with extended levers, and used units are often sold with such levers. Pretty small, I keep it in a bag 6"*10". Pumping is easy, prescribed frequency 1 stroke per second can be maintained by alternating hands. But is is so boring... Doing this every day for 4 hours will drive your crazy - and it takes energy too. Incredible Timo Noko :-) has designed wind-operated PUR-06, photo can be found on his website. After you use it in real-life conditions, and then leave it for more than a few weeks, you have to either pump clean chlorinated fresh water through it (preferably, once a month), or fill it with "biocide" solution to prevent micro-organisms growth on the membrane. PUR-35 costs 3 or 4 times more, and is 2 or 3 times larger (but again, see T. Noko's modification with removable fiberglass lever), and can provide 3.5 or 4 liters an hour. It is said to be more difficult to pump, but it has longer lever, - so I don't know. I never tried it. It can be used with 12V motor, but is sold without a motor as well, with a handle for manual pumping. There is also PUR-40, which is said to be more sturdy than PUR-35 (and probably provides 4 liters an hour). With a motor the efficiency will be much higher - I don't remember the specs. They are made by "Recovery Engineering". *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Tue Aug 17 2004 - 12:23:25 PDT
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