Pioneer's advice is worth heeding! When I started, I tried one Clark's flush and the epsom salts made me really, really weak. I seriously considered not doing another one because of the reaction I had to the Epsom salts. The reason for doing the prep with the ultra phos is to relax the ducts. I have had times now after doing all these flushes that just taking the ultra phos will release stones! I could not have made it doing the Clark flush, I was too weak to start with when I began this. You need to consider your body and your reaction to things - that is the difficult part here, taking responsibility for your own health! Welcome to owning your own health - let the healing begin!!!!