question: Hello.  My father is 70 and suffers with dementia.  It's been progressive,; he also has prostate problems, takes very little solid food, and is fed mainly by a peg.  My mother said that they noticed "dirt" in his urine.  He's very weak and is having diarrhoea for the past 2 weeks.  Any idea of what the particles in the urine may be a sign of?  Thanks very much.