How could bentonite passing through your intestines have any effect on the THC metabolites, which go from your body fat to your bloodstream to your urine? Bentonite is an inert clay that is completely indigestible. It never passes into the bloodstream and therefore has no contact whatsoever with the THC metabolites.

Bentonite products, like the magic drink & pill potions, work on the principle of dilution. That means they work because of the amount of fluids you drink along with them. They do not convert THC metabolites into something that can't be detected, as they, the makers and sellers, like you to believe. They do not "flush" them from your system. The only things that remove THC metabolites from your system are time and fat-burning exercise.
You can duplicate the actions of these so-called "wonder products" by following the guidelines in this link:

DILUTION: tips, tricks and guidelines

Never assume the word "toxins" meaning THC metabolites. THC is non-toxic, therefore its incorrect to label THC a "toxin".