I would dispute the need to subtract the initial DW reading. When
you make a batch the silver ions will combine with the ionic
impurities that are already in the DW to form non-conductive
particles that are not readable by the meter. So, in effect, the
initial DW reading is automatically taken out of the equation. If
anything I'd suggest you read the meter then ADD the initial DW
reading to give yourself a VERY rough idea of the TOTAL ppm. (i.e.
ions plus colloids). If you are using a TDS meter then you should AT
LEAST double what it says on the meter . If you want a TOTAL ppm
measurement my guess is that you should do this about 6 hours after
making the batch.
But of course a handheld meter is such a poor tool for measuring ppm
that subtracting the initial ppm is rather pointless anyway. The tool
is simply not accurate enough to bother with such minor details.
(Unless of course the water is very impure then you might as well
just forget about using a meter at all.).
Regards
David
From: Neville Munn <[email protected]>
Date: 25 September 2009 9:06:00 AM
To: <[email protected]>
Subject: RE: CS>How to gauge one's CS solution
The meter is telling you you have silver...if it's only silver you
put in the water it's only going to be silver the meter is
reading...after you do the subtraction thing from initial DW
reading before brewing.
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