I used super colon cleanse by Health plus inc. I'm not very sure what my doctor meant by unpure, but I assume that he meant that it can get you sick etc.
I must have read that whole fecal matter in blood thing, but I must ask my doctor about it before I can make any conclusions.
I don't think I have candida because, for one, I am a male but I have no idea how it can get into the digestive tract.