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RE: Temp mixing valves and RO units

Hi John,
Yes you can do it this way.
You will need a pressure rated pump [as opposed to a volume rated,
re-circulation type pump] capable of delivering 60 psi. to the RO unit.  You
would be better off with a continuous duty rated pump.  Most RO units
operate in a pressure range, but 50-60 psi is good.  
Almost all RO units are rated at 70+ F. degrees.  Meaning, the lower the
temp of the feed water the lower the product water output.
Your plumbing will need to withstand this pressure, so you will need
threaded, solvent welded or sweat fitted connections.  You might try
pressure rated PVC tubing [with the nylon braided shell], if you dislike the
idea of making these type of joints.  But really, PVC pipe with solvent
welded fittings is easy to work with.  Just remember to think about your
plumbing layout in advance.  Will you have a low tap point to drain the
system if needed.  Are all the lines pitched slightly to facilitate drainage
if needed.  Then again, maybe you are just talking about a system that has 3
feet of piping in it!
mike


> -----Original Message-----
> From:	listhub at andante_mn.org [SMTP:listhub at andante_mn.org]
> Sent:	Wednesday, November 28, 2001 11:57 AM
> To:	killietalk at aka_org
> Subject:	Re: Temp mixing valves and RO units
> 
> Question,
> 
> As someone else who is pondering the move to a real R/O unit from the Am.
> Pharm. "Tap Water Purifier" (which just went from 13 to 17 bucks on
> ThatFishPalce!!).
> 
> I am paranoid about cutting into my plumbing.  I live in a 100 year old
> house
> and I have learned that touching what looks like "easy" stuff opens huge
> worm
> cans.
> 
> Can I run an R/O unit with a sump????
> 
> Sounds like from this discussion that will not be enough water pressure
> for the
> R/O unit.  Is this true?  My plan was to not cut into my plumbing. Get a
> 55 gal
> drum. Fill it with my municipal water and pump it through the R/O unit.
> My
> municipal water is pre-softened.  Comes out of the tap at 110ppm but
> clorniated
> to the max with Cloramines.
> 
> All comments welcome.
> john
> 
> On 28-Nov-01 LeeH920226 at aol_com wrote:
> > 
> > In a message dated 11/28/01 11:11:37 AM, michael.stoecker at us_nestle.com 
> > writes:
> > 
> > << Most of us just dump the RO product water from our units into open
> holding
> > tanks/containers. >>
> > 
> > I have no idea what is best, but this is what I do. I have a needle
> valve on 
> > the waste water exit side of the RO unit (Kent bare bones 10 gal/day). I
> 
> > close this off to the point where I get about 10X the amount of waste
> water 
> > to purified water. If I open it all the way I get practically no
> purified 
> > water. This is a low output unit, but if I let it run all day it half
> fills 
> > the 20 gallon pure water receptacle and more than fills the 50 gallon
> "waste"
> > water receptacle. So I have to change more water in tanks that can use
> higher
> > TDS water in order to empty the 50 gallon drum, not a bad thing. If I
> forget,
> > it floods the floor and runs out the back door. Not a good thing but
> only 
> > wastes the higher TDS water and washes the floor.
> > 
> > Lee Harper
> > ---------------
> > See http://www.aka.org/AKA/subkillietalk.html to unsubscribe
> > Join the AKA at http://www.aka.org/AKA/Applic.htm
> 
> ------------------------------------
> John N. Alegre                   o
> Andante Systems               o
> eCommerce Consulting       o
> Custom Web Development <*{{{{}><
> ------------------------------------ 
> E-Mail: listhub at andante_mn.org
> Date: 28-Nov-01
> Time: 11:51:18
> ------------------------------------
> ---------------
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> Join the AKA at http://www.aka.org/AKA/Applic.htm
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