OK, I almost always take a series of enemas. My favorite experience is first getting cleaned out fairly well, then taking a very warm, very large enema until I'm totally filled. This produces a wonderful erotic feeling. and leads to an explosive orgasm.
But, to get there, I need to be cleaned out, first. When things go well, 2 soapy enemas will do the job, but they have to be a bit strong to produce a thorough evacuation. And, so, the first enemas need to be a bit uncomfortable to be effective.
Then, when I think I'm cleaned-out enough, I go for the last enema of the session, and make up at least 3 quarts of solution. Since there is usually still some water left in me, the total is probably over 3 quarts. I usually weigh myself so I can know when I have emptied out, but expect a weight gain of a couple pounds. I don't know if this is liquid just staying in folds of the colon or absorbed in the bloodstream.
When everything works just right, the last enema can be taken with just perhaps one pause, and often completely draining the bag without stopping at all. I get a big swollen belly, and have some waves of pressure, but no real cramping. It has to be quite warm, and not too soapy, for this to work.
Jon