No idea what Biz is! Sorry about Steve's treatise which did nothing to clarify; no idea what it is saying. I only want the basic fact of "this" or "that"! I have no idea what is or is not "bio" this or that! Never use bleach - maybe once in a few years if desperate situation. Chlorine makes me sick! Most household cleaners make me sick. Even ones allegedly "green". Ivory snow used to be my choice, with borax added for extra cleaning power. Doubt it exists anymore. Was it safe for the septic?