A cute idea but not very practical when you read the details. RO membranes need a 24bar pressure difference which means that the "bucket" needs to be at least 800 feet deep before it starts to work and then just barely. It's a lot less effort to pump a manual desalinator like a Survivor 06 or Survivor 35 than to deploy and recover more than 1000 feet of line and a weighted bucket. And if you're thinking of powering the line to make it easier, the powered desalinators are probably still more efficient in terms of volume of fresh water/kWh.
Fun discussion though.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, Kirk McLoren <kirkmcloren@...> wrote:
>
> tired of pumping?
> throw it overboard
> http://www.halfbakery.com/idea/Salt_20water_20well_2fFresh_20water_20bucket#1259847428
>
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