Pops - for anyone whose tap water is treated with chloramine, there will be a free ammonia (NH3) residual after each & every water change. Hence the reason why I spend the extra money for products such as Prime/Safe. (our water is treated with chloramine) If all I had to deal with was chlorine, I'd save my $$$ and buy sodium thiosulfate in bulk for a teeny tiny fraction of the cost of Prime/Safe.
So anyone that does have chloramine treated tap water, that reads the new & improved labels, better understand that using the new & improved instructions on their Safe containers will now only safely remove a portion of the chlorine AND free ammonia that it used to, using the old instructions.
Clear as mud?
IMO very poor decision on Seachems part. Apparently they are more worried about people overdosing and killing their fish from oxygen depletion, than they are by causing health issues from ammonia toxicity - which Greg compared to a mild sunburn. All I can say to that is WoW.