Do you have any opinions on the tapered or ball type tip, I just want to clear the turns. Also, I am thinking the small retention ball or none since the idea is to go deep, relax and flush, not hold... thoughts? Last thing, I am thinking of ordering the max 66" length since I don't want to undershoot the target. Is this a mistake?
My personal preference is the tapered tip though the ball type tip might just be a little more flexible in making turns because of its shape.
Know that if you are filling this deeply, it really isn't a matter of a fast flush (though you are likely to get "clear," but discolored, returns with several fillings or something else I haven't really discussed, the "constant inflow" and expulsion of the enema fluids. I accomplish that by positioning the enema bag under the shower-head nozzle, filling the bag and inserting one of the longest CT-75fr tubes to the point that the tube passes through the hepatic flexure without inserting the retention ball. Its actually a lot harder to accomplish this without practice (or help) but it can be done and is similar to colonic hydrotherapy.
Once you fill the ascending colon to flush out, you are going to find it a challenge to empty because it is really quite difficult to massage the liquid out. You can lie on your back or on your left side to help the liquid flow out, but it is difficult to press it around the liver. I find, by weight, that something close to a quart/liter remains in that I'm usually pretty close to two pounds heavier after the enema than before without a long retention time.
Finally, IMO, it is not necessary to reach the very bottom of the ascending colon/cecum. My shortest CT-75fr is 36 inches long and places it directly in the transverse colon and the liquid easily flows across the transverse colon into the ascending colon from that point. But I also know, from measuring such things, how far the tube has to travel for each section of my colon. I only have to get the tube inserted around 42 inches to reach the hepatic flexure. Beyond that the tube is in the ascending colon where things are still pretty liquid after discharging from the small intestine. Discharging the enema solution from that point will fill the ascending colon though the sensation of filling is not the same as using a standard short nozzle and a high volume enema.
The reason I limited myself to 54 inches was because if the tube is making the hepatic flexure turn at around 42 inches (and I can feel where that turn is occurring on my right side), adding another 12 inches down would place the tip pretty far down on the right side of my abdomen towards my pelvis. The diameter of the ascending colon is large enough that I don't generally feel the tube in there. It takes a much larger tube to feel that (the sensation with the 122fr tube is the passage through the hepatic flexure) But it is already tricky enough to get the tube that deep. And even if you only make contact with the colon wall with the tip, you can greatly limit the ability of the solution to flow.
With a smaller diameter tube, a good cleanout and a lot of enema solution contained in my colon (but not so much that there is a need to expel the solution), I can thread a 36fr tube about 60 inches in before I sense that the end of the tube has bottomed out in the cecum. But that tube is relatively "floppy" compared to a larger diameter tube and can meander through a filled colon even though it isn't folded over anywhere. Is it 6 inches worth of meandering? Probably. if you don't know the geography of your own colon, a somewhat shorter tube in the range of 48-54 inches is probably plenty to introduce the enema into the ascending colon. I can only offer my experience and perspective on this...not medical advice. So, keep that in mind in your selection of length.