@SwitchableSusie
I found this statement in the article listed below:
"The next was the Dierker Apparatus which symbolized one of the original "closed" systems. This came
in two styles and was described by Dr. Waddington as "promoting physiological peristalsis and working
free the contents of the pockets and diverticula." Also, there were different methods of administering
colonics. The "high" colonic meant that the rectal tube was inserted 54 inches or further into the
intestinal tract through the rectum, causing the water to "flush" out material. In the "low" colonic, which
is what we provide today, the rectal tube was replaced by a speculum or scope which was inserted only
3 to 4 inches into the rectum, allowing the water to slowly soften the faecal material from the rectum
through the sigmoid into the various parts of the colon."
https://www.gpact.org/docs/the%20history%20of%20colonic%20hydrotherapy.pdf
Also, in the original patent, there is mention of essentially exercising the colon to rehabilitate it. This may account for the rapid water inflow capability of the Dierker machines, which is much greater than current designs. I estimate a Dierker can probably fill a client with 4 quarts of solution in under 2 minutes. That's quite a flush and comparable to a disposable kit, specifically for Barium enemas, filled with water... maybe faster.