Magnesium sulfate / potassium sulfate / sodium sulfate
"Start a low fiber diet 6 days in advance w?lots of liquids, 3 days in advance start a soft food/soup diet using laxatives periodically throughout the week. The day before make sure the Suprep & water are ICE cold in the fridge, when drinking the solution use the straw & sip ice cold white grape juice (it's so sweet it cuts the taste of the Suprep). Process began about an hour afterwards.  Didn't have to sit in the bathroom just made sure I went when the rumbling began. Overall, WAAAAY better experience than 10 years ago!"