This device is more effective than an enema, but not exactly a colonic...BUT it should only be used if you have a water purifier connected to your water source. Never use tap water rectally...it contains too many chemicals that disrupt bacterial balance. Check out the Bowel Cleanse Forum for lots of info on constipation and ways to address it. Drinking sufficient water is a must...at least half your body weight in ounces a day! What you describe could be the result of parasites, candida, other pathogenic organisms, food allergies or a condition such as ulcerative colitis or Crohn's disease. Lactulose is a type of Sugar and parasites and candida thrive on it...best to avoid it and also the laxatives...they make the problem worse in the not-so-long run.