Everyone says distention is not permanent, but I know from my own experience that might not always be the case.
Right now my standard enema is 3 US Quarts, but it has not always been that way.
When I was 15 I found out about the 4-qt open-topped bag on line so I knew it existed. I was 18 before I was able to actually buy one for myself.
At that point, my standard enema had been 2 quarts since I was 7, and one imperial qt when I was 6.
When I first got that bag I was anxious to try it!
When I finally DID get to try it a week later, I fasted the night before and took 4 rounds the way I usually do when I do a clean out.
I filled the 4-qt bag with a heavy solution of soapsuds and water that was just a little hotter than usual. It went in surprisingly fast.and with some pain, and some nausea. Didn't actually vomit. Did scare myself on that however.
Overall I was satisfied.
Next time I took an enema a few months later I took a 2-qt bag like I usually had, any other time. The sensation just was not as strong any more.
Over the next few months I bought a 3-qt HWB style bag. That brought the feelings during injection and retention back to what they had been with 2 qt before that.
Deny, deny Deny if you will that distention can be permanent, but I know my own experiences. After my first use of a 4-qt open top bag, the 2-qt HWB style was never the same again.