I agree with Scott on definitely using warm water instead of the sodium phosphate solution that comes in the Fleet's. I'm occasionally lazy and think, "what the hell, " and use the Fleet's solution in a new bottle. Then I regret it with a very irritated anus.
I use a warm water enema 2-3 times per day. Without them, I cannot empty my pouch. I also use prune juice daily to keep things easier to empty but prefer the enemas. Even carry one with me to work in case the day runs long. I'm also hoping to avoid build up in my sinus tract. This pouch thing sucks!
Oh, one more point. I was thoroughly wash and reuse the enema bottles. No need to throw them out after each use if you keep them clean.