text: what exactly is colon cleansing and how effective is it?   when they flush your colon with water. it is suppose to keep you from getting intestinal viruses like stomach flu, but it will also cause problems down the road. your body has a natural process call peristalsis that help you have a bowel movement. when you continually interrupt that you will eventually be an old person that need a laxative daily or a depends and some wipes.