chlorine, chloramines and sodium thiosulphate

[Alberto Restrepo Ubach <restrepo at worldshare_net>]

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
AKA 08000
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