Firstly, in case theres no subject title here, it should say
'Subtracting initial ppm is Wrong'. (For some reason my subject
titles often don't appear.)
Anyway heres my theory.
Its often recommended that to calculate the actual IONIC PPM of a
batch of CS the initial PPM of the water is subtracted from the final
PPM. For example, if the initial IONIC PPM is 3 and the final is 20
then the 'actual' IONIC PPM is 17.
My theory is that the above recommendation is wrong and that the
actual PPM should be just whatever it finally says on the meter. My
reasoning for this is that I believe that the first silver ions off
the electrodes combine with the ions already in the water to form non-
conductive silver compounds, effectively taking the ionic ppm back to
a zero starting point. From then on the IONIC PPM rises to whatever
is finally revealed on the meter.
(You can substitute uS for PPM in the above theory if you wish. The
logic is the same.)
The background to this theory is that I have observed on a few
ocassions that running a silverpuppy in a jar of ordinary tap water
does not measurably increase the ppm (or uS). At first i thought this
was just meter error or a temperature effect but I finally realised
that it happened consistently. For example the initial ppm was about
200 but after running the silverpuppy for about 2 hours the ppm was
slightly less. Theoretically about 40 ppm has been added to the water
but I assume it has all combined with other ions to form particles.
I assume this process would continue until there is such an
unavoidable mass of particles in the water that new silver ions are
instantly gobbled up. (The end result being a jar of water containing
conductive non-silver ions and non-conductive silver compounds, but
almost no ionic silver.)
Using ordinary tap water may be an extreme example but i think the
principle may still apply in near pure water. Why should we assume
that the initial ionic content, of say 3 uS (of impurities) would
stay untouched by the incoming silver ions?
My conclusion then is that when using a meter to measure CS that has
been made with NEAR PURE WATER you simply accept whatever it says on
the meter as the actual IONIC Silver PPM. (Allowing for the usual
error and fudge factors of course). On top of that there will be an
extra weight of silver compounds/particles that we can guesstimate at
being about 15% extra.
David
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