Re: Temp mixing valves and RO units

[Wright Huntley <jwwiii at pacbell_net>]

David Lains wrote:
> 
> Hello All
> 
> The ROs I work with HP water factories are all rated at 77*F.  If you run
> cold water through them you get about 2/3 to 1/2 of the rated product water
> with the lost efficiency going down the drain. Used Temp mixing valves can
> often be found in photo stores or on the web? Ebay?  If your water/sewer
> rates are high, even a brand new mixing valve at <$200 would pay for itself
> in a year or so.  Plus you can use it for doing water changes giving your
> fish exactly the same temp water each time.

This may be a good industrial solution, but household water heaters are
usually too far and too poorly insulated to have much effect on water that is
trickling so slowly through the smaller RO system. My experience is that the
final 20' of tubing will set the temp of the water into the membrane. Just
keeping it in the warmest possible place is the easy way to increase
production.

Obviously, this depends on type of tubing, etc. I have had lots of temperature
blender experience (30 years running Holograf) and the same amount of RO
experience. Well, to be honest, I used DI for 20 years before switching to the
more economical RO systems. :-)

Wright

-- 
Wright Huntley -- 650 856-4245 -- 879 Clara Dr. Palo Alto CA 94303

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References:

• Temp mixing valves and RO units
• From: "David Lains" <david at zfin_org>

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