Boxcar; I don't remember where on the list stresscoat came out, it was nearly a year ago. I'll see if I have any notes from that meeting scribbled anywhere.
The rep took straight tap water, and had a chemical which I forget the name of, that tags chlorine & chloramine with a yellow dye. As the dechlorinator works, the dye disappears. I could ask around on Friday, see if anyone remembers the name of the chemical, or if they have any info to contact the rep.
As the dechlorinator is added, drop by drop to a measured container of water, you could see the color fade. Some, like Prime or Aquasafe, neutralized chlorine & chloramine with a little less than recommended. I remember one in particular, Novaqua, was pretty crappy. A friend of mine, who is a club member uses it, and I was giving him crap about it. Double the recommended dose of Novaqua didn't remove all the dye, add a couple drops of Prime, & it was clear.
Most dechlorinators contain sodium thiosulfate to neutralize chlorine & break the chlorine/ammonia bond in chloramine, sodium hydroxymethanesulfonate to bind the ammonia into a form that is non-toxic to fish but still available to the bio filtration as ammonia, and ethylenediaminetetraacetic acid, or EDTA, to lock up any heavy metals into a form that is harmless to fish. These are mixed with distilled water to make dechlorinator. Depending on how strong or weak a solution is mixed will affect how well the dechlorinator works.
http
/www.thekrib.com/Chemistry/cl.html has a good series on how dechlorinators work.
http
/www.thetropicaltank.co.uk/rev-cond.htm has some comparisons of water conditioners.