We use the Hydro San Plus Colonic Unit which is FDA approved and a level II Medical Device. Everything is disposable, including your sheets, gown and foot covers. The Closed Colonic System is the best colonic you can get. The Closed Colonic Unit is a Gravity Closed-Controlled High Colonic System with a built-in triple filtration system and an automatic temperature shut off and ultra violet light. There are no odors, all the colon waste goes through the disposable tubing and out through the sewer system. The Closed Colonic Unit is not just a gravity unit - it is a Closed and Safe system, not the same as an open unit where a much longer tube is inserted into the buttock area and the water is turned on and you are left alone with no one to explain anything to you. It is imperative you are safe and your colonic therapist is running your colonic unit while you are relaxing and listening to music.