I searched locally for Oxypowder , but wasn't successful. Instead, I found one that looks even more promising to me, it's called SUPER COLO2 ZONE with EDTA. (Google it for more info).
I like the looks of it more than what I have read of the other product for a couple of reasons. One, it seems to hold the promise of being a bit more gentle, and two, it contains a chelating agent that will help with heavy metal toxicity, which I know I have.