i just went to emergency room because i seen black specks in my urine they did a cat scan there was no stones in kidney but gall bladder has billary sludgeand some gravel type sludge.also moderate fecal through out colon .they told me to take colace stool softener 10 days and see a urologist i havnt had any pain when urinating but have had gas lately and now have sharp pain periodocily in center of my stomach hopefully just gas i always drink water still passing black specks with no pain