A good follow up test would be to heat the water to at or near boiling and let
cool down and retest.  If it is CO2 absorption, the ppm should drop back down.
If it is contamination it should stay high.

Marshall

Connie wrote:

> OK, here are the results of the simple test I did last night:
>
> I put 22 ozs. DW into a ball large mouth jar with my 5 gal. acquarium
> bubbler.
> Hanna reading prior to start =1.5 ppm
> I let it bubble for 2 1/2 hrs. Hanna reading =6.3ppm
> I simply unplugged the bubbler, loosely placed alum. foil over the opening.
> 18 hrs. later retested the DW- Hanna reading =8.1ppm
>
> Connie
>
> > From: Grant <g...@island.net>
> > Reply-To: silver-list@eskimo.com
> > Date: Fri, 18 Jan 2002 14:18:25 -0800
> > To: silver-list@eskimo.com
> > Subject: Re: CS>questions: stir vs. bubble
> > Resent-From: silver-list@eskimo.com
> > Resent-Date: Fri, 18 Jan 2002 14:23:00 -0800
> >
> > Seems to me a very simple test would indicate if foreign materials are
> > being introduced into your c/s by the "Bubbler"..
> > Just take u/s reading on your d/w.
> > Then run your bubbler through the water for some time.(Don't Make c/s )
> > Take another u/s reading. If readings are the same then you
> > can assume that no contamination has taken place.
> > Grant..
> >
> >
> > With all due respect Trem:
> > I have used stir  with a motor & bubble also no stir at all, and a chop
> > stick stir
> > by hand.  I to use a laser light and a pwt tester....but what makes me
> > assume my
> > CS is clean of dust as you believe, is I have three Clean Air Ozone
> > generators in
> > m
> >
> >
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> >