We also bought a lb of bulk zeolite powder, haven't opened it yet. But I can tell you this. It was only about 50.00. The NCD brand of liquid zeolite was the same amount for a tiny bottle. We used the liquid due to the claim that it is highly purified and goes through a special process that allows it to be more easily absorbed and utilized by the entire body. I have read claims that the powdered form is mostly effective in the intestines. Any opinions out there?