A question about Bentonite

I'm on day two of doing Bentonite and Psyllium shakes, oh and not fasting, just doing that alone right now. I must say, I am quite surprised by how quickly it passed through me, as I normally have quite a slow system.. so a very happy bunny this morning.

I noticed this morning that I must have passed it in my B/M's as it is like a greenish rubbery/gum type stuff. So how will I know when it is working to remove the nasties- what will the difference be and do you have to fast to make it work its best?

thanks ;0)