Dechlorinator doesnt. Dechloraminator (sp?) does. Chlorine is, well, chlorine. Chloramine is chlorine + ammonia. Dechloraminators break the bond between the two, and then dechlorinates the chlorine. My dechloraminator says that it neutralises the ammonia (dunno how though?). However, i THINK, that the amount of ammonia released should be small.
P.T.