Dear Richard Casady:

"Richard Casady" wrote in message
.. .
On Sat, 29 Sep 2007 13:57:27 -0500, Brian Whatcott
wrote:

(That would however take a hand pump capable
of supplying a flow at 15 psi plus. Like a bicycle
pump, or better? )

Grease guns are, some of them, capable of at
least. hundreds of psi. I happen to own a 0-5000
psi gauge. Bought it to check tractor hydralic
systems. I forget just what a grease gun pumped
it up to, but it was a lot.

But it was a *very* low flow rate. Brian is talking about "a
few" gallons per minute, to use cooler salt water in a tube on
the "fresh water" side to help carry off waste heat. And it is
going upwards a few tens of feet (then back down), perhaps
starting at atmospheric pressure. It would be hard work,
especially it it had to be kept up for an hour!

There is a reverse osmosis watermaker
intended for liferaft use, with a hand pump, and
RO takes hundreds of psi. That is what you want,
if you actually need high pressure.

I figure you probably can buy a small hand-held "single-shot"
pocket RO unit for just such a purpose...

David A. Smith