my own experiences say colonhydrotherapy (through your ass water being pumped in by a machine) is only beneficial if someone is seriously constipated.
in the netherlands there are a couple of therapists who seem to think it is necessary to do this stuff atleast 6 times which i think is bull. its all about how many and how easy going your bowel movements are. if thats fine no need to do more.
andreas moritz says to always do one (colonhydrotherapy) after a liver flush but i dont buy that either. if your regular it will come out anyway
better try some kind of herb first (MH's Lower Bowel Balance for instance). coffee enemas seem to be good though mainly because of their anti-oxidant action if i have to believe what is written and the action on the liver
ive done some traditional ayurvedic enemas too (part of pancha karma). i guess it did something. but again im no fan of this through the poop entrance stuff if its not dire