Colonic hydrotherapy, should i do this? what does it involve?

They are crooks: If you go to an enema parlor, you will be seen by a kindly, unhurried practitioner who will make you feel very comfortable, tell you things that aren't true ("toxic bowel settlement" and so forth), and reassure you that the treatment will greatly improve your health and that you had better keep coming back. Don't get involved with these people.