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RE: TDS Meters
This has been a very informative discussion, which i
have enjoyed very much. It's nice to hear the wealth
of knowledge out there. If i may add a liitle bit
more. I hope I didn't confuse anyone with my thread. I
primarily use my counductivity meter to measure my
source water before i put it in my aquariums. This way
I know what I have to start with and if i am in the
proper parameters. After the water is in the aquarium
DOC,s and other contaminants make a us/cm reading not
very effective for measuring water hardness but a
superior measure of overall water quality. For example
if our source weater has a counductivity of 5 us/cm we
can then measure and moniter that value. It will
increase over time as urine , feces, and other organic
compounds accumulate. Armed with this data we will
have all the information we need to make sure our
water quality is up to our standerds. Hope this is of
some help. Personaly I find my counductivity meter to
be an invaluable tool in my fishroom. I could go into
great detail on the chemical interactions going on but
I prefer to K.I.S.S.(Keep It Simple Stupid) Just use
your meter to test the water you plan to use and then
moniter your water quality with the meter afterwards.
Good luck all.
David Sanchez
--- "Morris, George" <gmorris at kester_com> wrote:
> I've been a little puzzled for some time now about
> the use of conductivity
> (TDS) meters. I've been under the perhaps mistaken
> impression that what we
> are concerned with in breeding killies is hardness,
> that is carbonate
> content. How do you know what you are measuring
> with a conductivity meter?
> How can you calibrate a meter without knowing the
> salt mixture in your tap
> water? For that matter, won't tannins show up as
> increased conductivity?
> I've always used a hardness titration. Is there
> something I should read on
> the subject?
> Regards,
> George
>
> -----Original Message-----
> From: LeeH920226 at aol_com [mailto:LeeH920226 at aol_com]
> Sent: Thursday, August 03, 2000 7:21 AM
> To: killietalk at aka_org
> Subject: Re: TDS Meters
>
>
> For anyone who is interested, the relationship
> between TDS and conductivity
> is variable depending on the nature of the dissolved
> salts. For the
> "standard" KCl (potassium chloride) it is 2:1. That
> is the conductivity in
> microsiemens is twice the TDS in ppm. For other
> salts it is different, as
> low
> as 1.17:1 for "natural water"
> For more details see:
> http://www.eutechinst.com/techtips/tech-tips12.htm
>
> The Hanna promotion is $14.90 plus shipping for
> the TDS meter. Check it
> out at
>
http://www.hannainst.com/products/promo/usa/usaprmo.htm
>
> Only valid in the USA until the end of the year.
>
> Lee Harper
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