There is a fairly detailed breakdown of what Amquel does to the ammonia on this web page:
http://www.novalek.com/kpd58.htm
and the rest of the site has quite detailed information answering your questions. I do not think it is magic.
Also, consider whether you can prove that the chlorine and/or chloraminehas all gone after 48 hours if you just leave the water standing - I have heard many different times quoted for how long that can take, and it's much easier to use a product that will do it straight away.
http://www.novalek.com/kpd58.htm
and the rest of the site has quite detailed information answering your questions. I do not think it is magic.
Also, consider whether you can prove that the chlorine and/or chloraminehas all gone after 48 hours if you just leave the water standing - I have heard many different times quoted for how long that can take, and it's much easier to use a product that will do it straight away.