When I used to sell water treatment equipment, we sold plastic pressure tanks 
for use as water storage tanks with residential RO systems.

Made from Polyproplene, NSF certified, never rusts, has an air valve to adjust 
pressure, non-replaceable bladder.
We had them from 1.5 to 3 gallons in size.

Should be able to find them at any decent water treatment equipment company.

Roy


On 2011-03-03, at 12:01 PM, Philip wrote:

> I would think it has something to  do with the shaft seal on the pump. I
> believe these are centrifugal pumps. An accumulator would keep a
> constant pressure on the shaft seal even when the pump is idle.
> Running the pump only to supply water to the faucet would not. Martec
> sells a magnetically coupled centrifugal pump and has no seal to fail.
> It's pricey, but dependable. I used them in Marine A/C and refrigeration
> systems I installed.
> 
> Philip
> 
> On Thu, 2011-03-03 at 09:40 -0800, Sea Quell crew. wrote:
>> Please post to the list if you find out the reason for that statement.
> -- 
> S/V ORYOKI
> Currently lying in Beaufort NC
> 
> "There's no point in making a plan if
> you're going to pretend to follow it!"
> 
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