Kalkwasser

[christyf5]

I just read this on reefcentral:

Posted by Bomber:

I wouldn't suggest using reagent grade or lab grade chemicals. Although they may be *pure*, you don't know what the trace elements are. Non USP/FCC grade stuff is frequently purified with some truly nasty stuff. The grades you want to look for are USP (suitable for use as pharmaceuticals) and FCC (suitable to use as foods). Some reagent grade CaCl in our lab had heavy metals measuring in the high parts per million - the FDA limit is somewhere in the low parts per billion.

I realize he is talking about CaCl here and not CaOH but possibly the lab grade stuff that people are using, ie. actual Kalkwasser and not pickling lime, could be worse??

Christy