Grey Kidney Stone Is It Normal To Have Bits In Your Urine?

Is it normal to have bits in your urine? - grey kidney stone

If you are always perfectly clean "down there". But whenever a bit of urine excreted in the urine. Who is not toilet paper, etc., but as a piece of meat, and small drops of particles suspended in IT, either orange or pink-gray. No pain / discomfort or odor. So do not kidney stones, is not an STD. It is only normal then?

First noticed in the catheter, as in childbirth a year ago. Still Get It Now, please, say it's normal?