I used colon hydrotherapy to prep for my last colonoscopy. It was a two day effort with a clear liquid diet and colonic the day before. I had another colonic in the AM on the day of my procedure which was scheduled at 1pm.
I did not use sedation and the procedure was very tolerable. I walked out and drove away within an hour.
This beat using the liquid oral preps and camping out on the toilet. The oral preps nauseated me the first time and I swore I wouldn't go through that again.
The colonics were a far less stressful prep and almost made the procedure enjoyable.