Re: [Killietalk] Water

["Bill Shenefelt" <william_shenefelt at verizon.net>]

Sam Ting.  (sort of)  Dissolved solids will conduct electricity by the
movement of the positive and negative ions of the dissolved solids thus
carrying current or conducting. . Most all meters measure conductivity.  The
readout may be in microseimens (The same thing as inverse of micro ohms
resistivity) or in PPM Total Dissolved Solids.  Meters may, as purchased, be
calibrated to read out in microseimens or in TDS.  The readout is based on
the conductivity of a mix of salts (solids which ionize readily).  A mix
known as KCl-70 (potassium chloride and distilled water) is often used in
many cases for a standard. The solution yields 70 microseimens of
conductivity and is used to set a meter at either 70 microseimens or 45 ppm
TDS.   For aquarium use, there is not much need to calibrate and the factory
set calibration will be close enough.
What this means to the user, is that 70 microseimens is the equivalent of 45
ppm TDS.  That is if your meter reads in microseimens, divide by 1.555 to
get a value in TDS. A high TDS does NOT necessarily mean high hardness!  Any
conductor will give a high reading, but if you get a value for your water in
hardness with a chemical kit by titration, you can always figure your meter
will reflect the variation of the typical minerals of solids present in your
water supply.
Bill Shenefelt
http://shene.killi.net
----- Original Message ----- 
From: "Duane Wake" <dwake at iopener_net>
To: <killietalk at aka_org>
Sent: Saturday, November 15, 2003 8:05 AM
Subject: [Killietalk] Water


>
> Hi all,
>  I know this has been done before but I need a refresher, what is the
difference between conductivity and total dissolved solids TDS? Any help
will be gratefully appreciated.         Duane
>
>
> To join the AKA see http://www.aka.org/pages/join.html
>



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