If this is about some sort of “cleanse” then I’m very skeptical that this is a good idea, and it’s likely worthless (or worse) for pouchitis. Nevertheless, I f you’re just trying to flush out the pouch then tap water is less irritating than the stuff that comes in a Fleet enema, and the Fleet bottle can be emptied and reused. It’s about the right size for a J-pouch. Some folks routinely flush their pouches as a way of dealing with incomplete emptying, and they have various ways of making this easy to accomplish.