I have actually had a colonic irrigation done, it doesnt hurt at all, you can feel the water entering and every 10 seconds or so you have to push, pretty much like when your having a baby. I had it done when i worked for a company that dealt with cancer patients. They had all kinds of natural alternatives to treating cancer and other illnesses. I wanted my hubby to do this because i thought it would help him, but later found out that because he has chrons disease(bowel disease) he wasnt allowed, it might actually make his situation worse.You can see what comes out on the side, as you push you see all the water come out,I didnt have anything come out when i did it, it all came out clear but i was supposed to have it done again.