First flush no results, not even a diarrhea!

My husband performed his first flush 3 weeks ago following the Hulda Clark 's instructions ( Epsom Salts , grapefruit+olive oil). He did not get any green stuff out, not even a diarrhea.

Then a week ago he repeated the process increasing the amount of Epsom Salts (one tablespoon more) and he got a small amount of green waxy "lentils". He is not sure if "that" is a cholesterol.

My questions are: 1. can he drink water during the liver cleanse (since the book says: "do not drink anything after 2pm....").
2. can he vary the amount of Epsom Salt intake without health consequences?
3. Is there any alternative way (more pleasant) to cleanse the liver?
4. How he can be sure that stuff he is getting out is cholesterol?