The Global Professional
Association for Colon Therapy

"A Self-Regulating Educational and Certification Body
~ Unsurpassed for Certified Colon Hydro-Therapists Since 2009"

Open, Closed, Gravity

Open, Closed, Gravity

What's the difference between the colonic devices/systems?

It is believed that 70% of Colon Therapy around the world is conducted on "Closed Systems". Many people develop a preference for one system type, but you should know the differences to compare and contrast for them for yourself. 


Open system

does not contain waste

Closed system

contains waste

Gravity system *

contains waste

System types Open Closed Gravity
Water is introduced via natural gravity  
Water flow is controlled by a flow control/valve and pressure gauge    
Client "pushes" as when on the toilet to evacuate the bowel    
Client is passive, no "pushing" involved  
Client has bowel movement in an open space    
Client has bowel movement in a contained waste speculum  
Therapist conducts therapy
Client may be left alone during the therapy never acceptable never acceptable never acceptable

* Please note that in the U.S., the gravity systems are not approved for legal use.

Closed Colon Hydrotherapy System

With the closed system, the water pressure can be adjusted of the inflow of filtered, temperature regulated water.  This means water enters the colon very slowly or potentially less than 1/4 psi (pound per square inch). Typically a session ranges from 40-65 minutes.  What is known as the speculum is inserted into the rectum via the anus, and allows the water to flow in via the fresh water inlet, and out via the larger tube that allows the waste and water to leave the body in a passive way.  The speculum is approximately 3/4″ in diameter.  It is gently inserted 2-3 inches into the colon.  It comfortably holds the anus open during the session, thereby removing the need for the recipient to push the waste out. The water line connects to the incoming water line on the equipment, and the waste line attaches to an illuminated glass viewing tube that allows for observation.  The waste goes out the speculum into the disposable waste line, then empties directly into the sewer system after passing through the view tube.  The waste is “closed” to the air, hence the term “closed-system”, no open lines of water or waste.  The recipient remains on the treatment table throughout the process.  A professional therapist administers the colon hydro-therapy session, and is present during the entire session. The sessions consist of a series of inflows and outflows that can be accompanied by abdominal  palpation techniques and massage. 

Open Colon Hydrotherapy System

With the open-basin system, the table on which the client rests has a basin set into it.  The equipment is plumbed to the sewer system from the bottom of the basin.  The client’s buttocks are at the edge of the open basin so intestinal waste may fall easily into it.  The waste is “open” to the air, hence the term “open-system”.  Water comes from a gravity tank system and/or a pressure system set in a cabinet at the foot or side of the table.  Tubing connects the tank with the speculum.  The equipment is designed so that either the therapist or the recipient may administer the session.  Water pressure is regulated.  The maximum pressure is 1.4 psi in gravity mode and 3 psi for pressure flow.  The speculum for the open-basin system is narrower than a pencil in diameter and 4 – 10” long.  It goes into the anus about 2 – 4″.  The recipient pushes when he/she feels the urge to defecate.  The water and waste are expelled around the tube and into the basin meaning that unlike the closed system where the waste travels inside the tube, this open system allows waste to expel around the thin tube.  The recipient can also choose to retain water in the colon during the session as long as they tighten their recutum .  For the open-basin system, the client remains one position to accommodate the basin.  The open-basin works particularly well with spina bifida, paraplegics and quadriplegics or any other population that has extremely loose sphincters muscles.