Re: ram fry, sigh-Now: TDS -Conductivity

["Max Gallade" <mgallade@hotmail.com>]

Dave ,
I like to ad a quote that I kept on my files from a earlier Apistogramma 
list posting,It's about the  conversion from Conductivity to TDS,Sorry for 
not remembering the author :
Conductivity is a measure of the water's current carrying ability, while TDS
is determined through a gravimetric test. The conversion is an empirical
one, and varies from about 0.6 - 0.9 x µS to obtain ppm TDS. The value
shifts with the types of ions involved and the temperature of the solution.

Check with your local water supplier. If you are on their lines, they can
give you the local conversion value easily enough, and most likely will know
something about the aquifer if you aren't. This value should remain
relatively intact if you have to soften your water and do so with RO or
distilled. It probably won't if you use something like peat filtering, and
certainly won't if you're hardening the water.
Most of the time, in non- critical calculations (_extremely rare_, if
existent, that the determination is critical for our purposes), just shoot
for center mass and use the median 0.75...end of quote
These links were pulled of a Discus forum and are very helpfull to:
http://www.corrosion-doctors.org/NaturalWaters/Lang-TDS.htm
www.filterswater.com/convtds.html
HTH

Max



----Original Message Follows----
From: David Sanchez <barbax2@yahoo.com>
Reply-To: apisto@listbox.com
To: apisto@listbox.com
Subject: Re: ram fry, sigh
Date: Thu, 24 Jan 2002 12:15:15 -0800 (PST)

TDS meter and Counductivity meter are the same thing
just measuring the same thing on a diffrent scale. ie
ppm or DH 30 ppm is 1 DH diffrent scale same thing. So
if you have a tds meter you still look for the
diffrence in your reading from the first reading. ie
your tank TDS is say 50 next day its 100 this change
in 50 TDS is your level of pollution that has
accumulated since your last reading. So keep your TDS
meter you wont need to buy a Counductivity meter. They
both will do the same thing. Hope this helps.

Dave


--- "R.B. Jones" <jonescamp@mac.com> wrote:
> >  To me the greatest
> >value in conductivity meter is not in telling me
> how
> >hard my water is but rather in telling me the water
> >quality that I am maintaining for my fish.
>
> a series of articles on conductivity in an old batch
> of TFH mags
> convinced me that i should replace my strips and
> color changing
> liquid color comparison tests with some decent
> electronic meters
>
> my budget allowed for a pH meter and a TDS meter
>
> well, i never found the last of the articles in that
> series, but
> remember that their author spoke of TDS and
> conductivity almost (not
> explicitly) interchangeably
>
> i'm sure there are clear distinctions, but my
> question is this:
>
> is a true conductivity meter going to tell me enough
> new data (beyond
> my TDS readings) that it might warrant another $$
> investment?
>
> i guess what i'd be looking for is something like a
> FAQ on how to get
> the most out of  a conductivity meter.
>
> anyone?
>
> Bueller?
>
> -R.B. Jones
> Phoenix, AZ
> apisto/pond/reef
>
>
>
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