Magnesium sulfate / potassium sulfate / sodium sulfate
"Took my first dose of the salty cherry flavored liquid. Cool water, thick smoothie straw, less than 2minutes! Did a 20oz of water each half hour after for an hour and a half.....it hit me 10 minutes in, no cramps or rush to the potty. Just needed to go like normal, first ten minutes and fluid was coming out more clear. The key to the taste, get it down quick and don't think about it (lemon wedges are a saving grace). Trick to easing potty pain, eat light three days before, liquids ONLY the day before and easy as 1,2 and done!"