Besides liver problems, what could be the cause of pale stool? (almost constant)

Billiary disease. A large dose of diarrhea medications containing bismuth subslicylate, such as kaopectate (kaolin and pectin) or pepto-bismol, may cause stools to temporarily turn white. Stool may also turn white after swallowing barium sulfate before receiving a barium enema test. Anything that prevents the bile to reach the intestines may cause it ( narrowing, stricture, tumor, or billiary cirrhosis.