Hi 1993! After my recent experience, an enema beforehand is probably correct. One may not be enough? I had a sygmoid scope and they told me to use MIROLAX to pre clean. It did nothing. I told them I have no peristalsis and can't force movement. They didn't listen. I told them I had a J-pouch and they didn't get it. They brought me back to my room after the failure and gave me 3 enemas to prep me and seemed aggrevated that I didn't clear out and I lengthened their day! I was so humiliated! I KNOW I can't clear on demand especially after no food or liquid for 24 hours! I told them if they had let me have a couple OREOS before the test, I would have been completely cleared!! Good luck with your procedure!! What is an S-pouch?? Please let me know how your procedure goes?