http://www.reefkeeping.com/issues/2004-04/rhf/feature/index.php
The use of "TDS" (total dissolved solids) meters for analyzing the purity
of fresh water has become widespread in recent years. Many aquarists use
them to determine if tap water purification systems such as reverse osmosis
(RO) or reverse osmosis/deionization (RO/DI) are working properly, or if
deionizing resins need to be replaced.
The use of such devices, however, is not without complications. Contrary to
what the name might imply, for example, these devices do not measure all
dissolved solids. There are also many different units of measure used with
TDS meters. While all are referred to as ppm (parts per million), they are
still different, just as degrees Celsius are different than degrees Fahrenheit.
.................................etc
Good article
Ode
At 10:06 PM 9/20/2006 +0930, you wrote:
Hi Terry
i also thought it funny that Angel said that the rods were wearing down ,
if there wasn't actually alot of cs being produced, but i thought it might
have been a mistake, as the silver cannot just disappear. I find it
strange that there would be any noticable change in the rods over a short
period of time as i can use mine for several months before i can see any
significant change in rod thickness.
and surely if Angel was producing stronger cs but failing to get a correct
reading as to the ppm, the silver would have discoloured the water to some
extent.
you make mention of the inaccuracies involved with using TDS meters to
measure ppm could you pass on some information to me about this as i use a
TDS meter to test for ppm and would like to learn more, any links you have
would be a help if you dont mind.
Thanks alot
Nathan
From: Terry Chamberlin <[email protected]>
Reply-To: [email protected]
To: [email protected]
Subject: CS>Angels CS problems
Date: Wed, 20 Sep 2006 08:09:03 -0400 (EDT)
Angel said,
>They realized all they were doing was wearing down
their silver rods.<
If you are *wearing down* your silver rods, it is
working. The rods don't *wear down*, they dissolve. If
they are dissolving quickly, your water is getting
plenty of silver.
I think the issue may be in what you think you are
getting. You said it was 3-4 ppm. How did you arrive
at this number? The only way I know of accurately
measuring ppm is with a spectrophotometer, which I
assume you don't possess. The readings you get with a
TDS or PWT meter are not ppm, and must be translated
into ppm using various formulas which are not
dependably or consistently accurate.
I had a sample of my CS tested by a local Industrial
testing laboratory some time back and was told it was
5 ppm. I KNEW that was wrong, so I had them test it
again. They said, Oh Yeah, sorry, it is actually 7
ppm. I sent some of that same batch to Old Bob, and he
pronounced it to be 18.7 ppm, very small particle
size. I asked him why the difference in testing
results, and he said the lab near me didn't know how
to test for the nanosilver portion (what he called
'ionic').
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