This scientific paper, "The Fundamental Conductivity and Resistivity of
Water" should help.
http://www.thorntoninc.com/pdf_files/tech_pubs/ECS_04.pdf

Paul

> -----Original Message-----
> From: piclist-bounces@mit.edu On Behalf Of Mike Hord
> Sent: Thursday, March 24, 2005 2:48 PM
<snip>
>
> Quoted from a reply by Jan-Erik, buried within a [PIC]
> thread...
>
> Where I work, we have a NanoPure filtration system which
> is fed deionized water.  The little gauge for water quality is
> given in MOhms of resistance; we get worried if it drops
> below 18 MOhms.
>
> Of course, I don't know what that means- if it's a reference
> to "resistance per centimeter of a 1 cm diameter column",
> or what, but I'd imagine it's over a pretty small distance.
>
> Anyone else have any input on this?  It's a good thing for
> people like us to know more about.  Perhaps I'll do some
> experiments...
>
> Mike H.

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