Magnesium sulfate / potassium sulfate / sodium sulfate
"Second colonoscopy,  first time, I was given pills to take with lots of liquid. Suprep method   is harder, lots of water/ liquid to drink in a short time, that being said it started working within 10 min., wasn't expecting such fast results! TASTES TERRIBLE!  BUT Ice cold water to mix prep helps, I also had some warm chicken broth that I drank after finishing the prep solution, helps get that sickening sweet aftertaste out of your mouth  , the slice of lemon & the straw also made ingesting this stuff bearable."