It is funny, I can get it at the grocery store. It is one specific
brand, and says on the label "suitable for laboratory use". Before I
would believe that, however, I felt I needed to round up every single
different brand of distilled water I could find, and test all of them
using the Com 100 EC meter. Surprisingly, some of the brands registered
at 50 uS (micro siemans, or use to be micro Mohs), which is way too
high for me to even consider using it, except in an emergency, maybe I
would think about it, still 50 uS is better than my tap water, which
has lots of minerals in it. None of the others was as good, and I
still test each gallon before I use it, just out of habit. It is always
under 1.5 uS, and occassionally zero. After I pour some out and use to
make cs, the rest in the gallon increases in conductivity, which is the
air going into solution in it. Still, I use it anyway. I can get very
particular, but there is also the limit of practicality. In practice,
it does not make so much of a diff for me, but that is with low volts.
If I felt it was a bigger deal, I might just make a gallon at a time,
instead of a quart.
I have heard that in different parts of the country, the best distilled
water varies by brand (depends on the equipment used, source water, and
probably other factors too). Some areas say Walgreens brand is good,
but it is not in this area. I have found that Glenwood Springs
distilled water is the best brand around here.
How are you keeping the air out of your system?
My system is pretty rudimentary too, it is silver wire (.9992)
batteries, wires, and a potentiometer ( or one could use a resistor).
No timer or anything, though that would be easier.
Kathryn
On Oct 22, 2008, at 11:25 AM, indi wrote:
Thanks, Kathryn.
I'm glad to hear you are employing careful controls.
You are definitely correct that the HVAC model I'm using would put me
at greater risk of introducing undesirable foreign elements into the
mix. Another good reason for my concerns about accuracy. Also, my
current generator is quite a crude homemade one.
Where do you buy your lab quality DW?
Cheers,
indi
On Wed, 22 Oct 2008 11:02:18 -0500
Clayton Family <[email protected]> wrote:
I am not ignoring your point. Degrees of accuracy in my experience,
range from good enough to several decimal places in a calculation. It
all depends on what one is interested in looking at. In school I had
to write up error calculations that ranged several pages of math
sta
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