Volume no longer is paramount to me.
Once upon a time I strove to expand my capacity beyond two quarts. Back then an orgasm always occurred during the enema which caused difficulty with draining the enema bag. Little by little my capacity increased.
One way was via the gradual stretching of my latex bag and the other way was by siphon-filling my combo bag. Sometimes I added extra solution to my open top bag, which was a pain to do.
I also experimented with a large pumpkin ice bag,using the four-in-one-cap from the two quart model. Doing that posed a suspension problem. so I didn't use it that often. It was awkward even when someone held it.
Somewhere in there I obtained my first single balloon nozzle. That helped deliver the added volume, but the orgasms were still an issue, as the larger enemas were quite erotic.
The black Sherema four quart bag meant no tricks to increase the enema volume. Age was also helping in that the involuntary ejaculations were less frequent. In a few years I was able to take four quarts. For a while there the knowledge of being able to take a four quart enema supplanted the sensations and pleasures of the enema itself.
Taking four quarts was never easy,and more often than not, it was a chore. I eventually decided to dial it back and put the emphasis on pleasure rather than measure.
For the past few years I've taken a handful of four quart enemas, Most have ranged in volume from one quart to three and a half. Predominately my enemas are either two and a half or three quarts of solution. A side benefit of the reduced volume has been an increase in the retention time of my non-double balloon enemas.