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Old 03-04-2007, 16:19   #16
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"high efficiency" watermakers

The brine output water is depressurized as it runs through the output section of the Clark pump. The energy recovered during the depressurization is used to assist in the pressurization of the input water, thus saving power. Here is an animated gif image from the Spectra website that illustrates how it is done:

The Spectra website is:

I'm far from an expert on this, but I do have a Spectra watermaker on VALIS, and it does indeed put out almost one gallon of fresh water per Amp-Hour (at 12V). This is about half the power consumption of the earlier generation of DC watermakers. There are one or two other companies who now have systems with comparable efficiency.

Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
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Old 06-04-2007, 10:18   #17
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The 800 PSI exists only in the high pressure pump, high pressure lines, and the pressure vessels. Think of the pressure vessels as a garden hose. Normal household water pressure is 60 PSI. If you open the nozzle just a little water does not shoot out at 60 PSI it just dribbles out. You still have 60 PSI in the hose. The porduct and brine are at very low pressurs.

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Old 08-04-2007, 13:40   #18
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Hey there,

You've probably seen this, but if not, it's a good read for making your own.


Fair leads,
Aaron N.
"Only those who see the invisible can do the impossible."

W32 #482 Asia Marie

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Old 18-04-2007, 09:48   #19
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TomJ, I think that you have done more than enough research. Just do it! Enough with the theory. Time to start odreding and spending some money. I followed Rutu website and put one together last year. We've been drinking our water and making 40GPH. We had some problems along the way, but I am very happy with mine. The problem in building it yourself is that you have to become a chemist. And then there are no places to call and get some answers when you have problems. Dow website is a good troubleshooting place but you have to become a chemist to understand some of the terminology.

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