Stool is old stool that has been stagnant in the intestinal canal for a long time. Generally, 3 to 5 days without stool and stay in the intestinal canal of the stool is called persistent stool. It is often very stubborn, and it is not that easy to get rid of it. Some people even pick out the stool by inserting their fingers into the anus. The hazards of persistent stool are more, mainly in the following areas: First, due to repeated prolonged forceful defecation and prolonged pressure on the intestinal tract caused by anorectal disorders, such as proctitis, anal fissure, hemorrhoids, fecal obstruction, colonic diverticulum, rectal cancer, or even the formation of fecal ulcers, the heaviest can lead to intestinal perforation. Second, excessive force defecation, increased abdominal pressure, physical exertion induced heart, cerebrovascular disease attacks, such as angina pectoris, myocardial infarction, cerebral hemorrhage, sudden death from stroke, etc.. Fourth, due to each prolonged forceful defecation, so that rectal fatigue, anal sphincter spasm contraction too tight, reflexively caused by spasmodic contraction of the pelvic floor caused by sexual life disorders, resulting in non-ejaculation or loss of libido, sexual life without orgasm, etc.. Fifth, when constipation metabolites long stagnation in the digestive tract, the role of bacteria produce a large number of harmful substances, such as methane, phenol, ammonia, etc., these substances part of the diffusion into the central nervous system, interference with brain function, affecting brain function, memory loss, distraction, slow thinking, etc.. Sixth, various toxins in the feces remain in the body for a long time, reaching the body surface through the blood circulation and accumulating, resulting in skin damage, resulting in increased discoloration of the face and neck, increased wrinkles, rough skin, dull face, no luster. Seven is not timely excretion of feces, fecal indole, fecal odor and other substances generated in the intestinal tract retrograde, so there is a bad taste in the mouth, speak with fecal odor and other strange smell, affecting interpersonal communication. There are various methods to remove fecal matter, such as regular diet, regular bowel movement, abdominal massage, medication, and bowel cleansing. Bowel cleansing has been accepted by most people because of its simple method, thorough effect and no need to strictly control diet. The principle of lavage is to dilute the stool in the large intestine by repeatedly flushing with water and then expel it automatically through the canal. This method is superior to cleansing enemas and medicated bowel movement methods. It is especially suitable for patients with irregular bowel movements, old and weak, fear of bowel movements after anorectal surgery, and patients with anorectal diseases.