I have posted this several times but here goes. I had 6 inches of my colon removed. Try to drink 64 oz. Liquids daily. (Hate water so I mix it with tea, little soda, pure watermelon juice, etc.) My stool most often comes out in dark, round balls. I have yet to hear of anyone else with this problem. I have increased my fiber intake considerably & sometimes, but rarely,have normal movements. However, I am fortunate in that I feel fine.