no, it should not be thick. I used to shake it again before I drunk it. Leaving it for a few hours really increasing the absorptive area of it - so put them together, shake it, and leave it there for a few hours.
If it is thick than you should add more water to it. As I remember you add a tablespoon Bentonite and a teaspoon psyllium to 2-3 deciliter (10 ounces) water.
It has much better effect when you connect it with a juice diet - so you don't eat solid food. It should be alkaline too - so taking cayenne, lemon or lime is the best with/beside the other fresh juices.