Zero..which can be as high as 2 [which isn't "wonderful" water] or even 3-4 microsiemens of conductivity [uS]..depending on how accurate your particular PPM meter is at such low ranges. Using a PWT or COM-100 .2 uS is the best I've seen. An average "good" is around .8 uS
[or somewhere around one tenth to one half of zero on a PPM meter]

Zero is generally good enough...depending more on "what" is in it, more so than "how much".

If your CS looks good, it probably is.
 If it looks bad, it probably is.
If you have oddball problems, change the water [and/or container] first ..no matter what the meter reading is.
 Water is the biggest variable.
Rarely, even a fingerprint left on the wrong day after eating something can mess things up.

Ode

At 05:39 PM 4/5/2006 -0700, you wrote:

using your TDS what measurements are you looking for....TIA...deb

sol <sol...@sweetwaterhsa.com> wrote:
Most distilled water is produced *locally* to where it is sold.
Therefore, it is necessary to try various brands in your area, and see
which one works best for you, or is the least conductive when tested
with a meter (PWT, TDS, COM-100).
Commercially sold distilled water can also be quite variable within a
brand.
sol

. . wrote:

> I'm wondering what brand of distilled water is the purest... ???
>


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