Drinking too many shakes?

I'm getting to do a Bowel Cleanse. I bought the Psyllium Husk and Bentonite (bad spelling). The Psyllium bottle said to only take a tablespoon a day, and the bottle for Bentonite said to take 1 tablespoon a day also. People on this site seem to be taking way more than that by drinking 3 or more shakes a day. I'm wondering is that safe for a long period of time? I just don't want to OD on it. Tweet