Yes the powder residue does fizz in vinegar<a href=showthread.php?s=&postid=14259559#post14259559 target=_blank>Originally posted</a> by bertoni
Hmm, I'm not sure what happened, then. Warmer water can cause more precipitation, but that's unlikely to be an issue. I haven't used that product, so I can't say much. Does the precipitate fizz in vinegar?