How strange

Something strange happened to me; given that I've been doing at least two 2-liter enemas of salt water or baking soda (rarely) every morning for at least 45 years, sometimes during the day I indulge in longer sessions with multiple enemas, even coffee ones. I've always had this two-liter limit, which, once inserted, forced me to rush to empty because I couldn't hold it in. But since I also have a 3-liter bag, I tried to go beyond that several times; only once did I reach 3 liters, and only once 4 liters by connecting two 2-liter bags with a "Y" connector. About three months ago, the 2-liter PIC bag began to tear, and I ordered another one without looking at the brand. I received a bag that looked identical to the PIC. Using this new one, strangely enough, I was able to retain all the liquid without difficulty, with a decidedly pleasant sensation of lack of urgency. After a couple of weeks, I had a doubt, and measuring the capacity with a graduated container, I realized it only held 1.6 liters of liquid instead of the 2 it was sold for. So I went back to using the 3-liter bag and, while I was at it, tried again to go beyond the 2. To my great surprise, I can now take the 3 liters with relative ease and even hold them (for a very short time) until I reach the bathroom without incident. Isn't that strange?

Practice makes perfect working up in volume as well as patience to take the volume slowly allowing your colon time to expand and take it.

This seems obvious to me, but I don't think you read my post carefully.

I'm not a medical professional, but my understanding is that the colon has multiple sphincters. One is the anus--we all know about that one. Not far from it is the internal anal sphincter, which keeps everything cinched tightly closed until you voluntarily open it to poop or pass gas. Rarely, it opens involuntarily under heavy pressure, such as diarrhea or peristalsis.

But there's another sphincter, the ileocecal, where the small intestine meets the large intestine. When it's closed, it keeps the contents of the colon from getting back into the small intestine. However, it can be forced open by pressure from a large enema. I suspect that your sudden ability to take more than half again as much as you used to might be that sphincter being opened.

@PinotNoir it could be a hypothesis