This is what ive learned and have expierenced. I use a product called EQUATE, from walmart, very in expensive and effective for giving you a large and easy to pass predictable movement daily. And after using it i gave myself a few enemas and my result was a very clean elimination. Ive been to a few colonic clinics and the results were the same, your large intestine dosent have a build up of un digested foor from years past! no way! I just went in for a colon test and with the prep i used i saw the monitor and my large intestine was squeaky clean and im 66. Your all being misled, i never used anything but the store brands of fiber mix.