Scott wrote:

Has anyone ever tested water after it has had a chlorine neutralizer added
to it, to see how well they work. The reason I ask is that I have been using
Kent chlorinex for a year or so. I changed to it after using the more
expensive tetra one, and it seems like its never going to run out. You only
have to add four drops to eight liters of water and its supposed to work
straight away, but I'm not shore how effective they are.

They usually contain a small amount of sodium thiosulphate, which
destroys chlorine catalytically. Thus a very small amount of dechlor can
destroy a huge amount of chlorine, but the less you use the longer it
takes.