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Re: chlorine, chloramines and sodium thiosulphate

Take a look on the labels of the chlorine removers in your LFS. Over 
half of the different brands use this compound or a close variant of 
it . Chlorine and chloroamine goes to chloride ion and the reaction 
is very quick. The process is inexpensive and generally used in 
industry to dechlorinate water prior to de-mineralizing. As long as 
the pH stays below 8.5 the amine portion of the chloroamine is 
inconsequential. The pH of the reacting solution does drop, an extra 
plus for most killie keepers.

I have used thiosulphate exclusively for chlorine and chloramine 
removal for 35 years. I have patent information from the 60's and 
70's regarding AmQuel and closely related products. They are 
available in the chemical trade in bulk quantities, etc. But, they 
don't lower the pH like thiosulphate does and over a short time, the 
amine is back anyway.

Use your thiosulphate, and if you have a lot of it (100 lb or 
more)contact me off the list.
Regards,
Charles Harrison, Ph. D
St Louis, MO


>From: Alberto Restrepo Ubach <restrepo at worldshare_net>
>Subject: chlorine, chloramines and sodium thiosulphate
>
>First off, thanks to all of you who responded to my inquiry about air
>pumps.  Your suggestions gave me a good idea on how to go about
>consolidating my air source(s).  Now, another question for those of
>you with some knowledge of water chemistry:
>
>I have access to lots of sodium thiosulphate.  As I understand it,
>that is the stuff out of which most 'old style' de-chlorinators were
>made.  In other words it works great to neutralize chlorine.  But now
>that the water supply of most metropolitan areas in the U.S.A.
>contains chloramines in significant amounts (i.e.: enough to kill my
>killies), is sodium thiosulphate of much use?  Does it act on
>chloramines the same way it does on chlorine?  Or does it have an
>adverse consequence?  (I seem to remember a discussion some time ago
>in which someone suggested that the typical de-chlorinator was --at
>the very least-- useless for chloramines, and maybe even harmful.)
>
>And last BUT NOT LEAST, if sodium thiosulphate is not very useful
>given modern municipal water treatments, what chemical(s) are used in
>products like AmQuel to 'neutralize' (is that the right term?)
>chloramines?
>
>Thanks.
>
>Alberto Restrepo
San Diego
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