Quote Originally Posted by Rudeofus View Post
Jim, a chemical that you have sitting around unused and with no future purpose is basically free. That's hard to beat!
It's far from free when you factor in the time, trouble and perhaps other chemicals needed to convert it. And the OP lives in the US. Converting sodium metabisulfite to sodium sulfite rather than buying some is what I would have to call "penny wise and pound foolish".