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Well the production rate of all watermakers ages slowly over their life so I
guess it would be very difficult to judge ageing, especially with changes in
salinity producing changes that would mask the symptoms. I was quoting the
specific instructions that came with our water maker for achieving maximum
life.
Air should not be a problem because even a tiny amout of air in the water
will prevent the pump reaching full pressure or stop all pumping. On our
unit we trap any incoming air in a fairly large hydrocarbon filter that
traps air in a cavity at the top. This connects to an automatic air bleed
valve. If air does get in our system we have to drop the pressure down to
zero to allow it to flow through the pump. As a safe operating principle,
we always start at zero pressure and then raise it after the pump is
running.
Regards,
Andina Marie Foster,
----- Original Message -----
From: "Rick Morel" <>
To: <>
Sent: Thursday, December 01, 2005 7:28 AM
Subject: Re: lv-ab: Water maker / wind generator recommendations
> At 08:33 PM 11/29/2005, Andina Marie Foster wrote:
>>You can stick with a salt water membrane but you have to have an
>>adjustable pressure regulator so you can drop the pressure as the salinity
>>goes down. The aim is to keep the product water rate equivalent to the
>>membrane design. For example if the manufacturer recommends 5% product
>>water and 95% water flowing over the membrane then although it will put
>>out much more than this is brackish water you must drop the pressure to
>>get back to the same ratio. This makes sure there is enough flow and
>>turbulence over the dirty side of the membrane to keep it clean. Too high
>>a production rate will clog up the membrane.
>>
>>This can take some vigilance in places like the ICW where the salinity can
>>change rapidly and frequently in some areas.
>
> I used a PUR 40E watermaker almost every day for two years in salty,
> brackish and fresh water. I never had a problem with the membrane nor
> noticed any difference in production (I always checked on the first bit to
> fill a jug for shutdown water). Could it be because the 40E is low
> production? I honestly didn't know and didn't see anything in the manual
> about it.
>
> Is this like the air thing? To explain, West Marine (or BoatUS) info
> stated that air would "explode" through the membrane and damage it, but
> PUR stated in the manual, and when I called them, that air would just cut
> down on production.
>
> ????????
>
> Rick
>
>
> ------------------------------------------------
> Absolute safety is a concept promoted by those
> without the guts to live in the real world.
> ------------------------------------------------
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