If it works too quickly, yes, you'll get dehydrated, but colon cleansing does help rid the body of toxins that stick to the walls of the digestive system. One way to do this is
to fast; no food in, food out. Another quick way is
to use coffee
enemas, but fast means it can be dehydrating and should be done only under the care of a professional. To do on your own, find a product based on things such as psyllium and other fibers, which will gently scrape the digestive system walls.