I had them twenty or thirty years ago. Did the blasting thing and some passed. They damaged a kidney and that was painful and another trip to ER. One got stuck in ureter (sp) and after a week in hospital they had to go in and yank it out. All in all it was quite an impressive couple of weeks. Then of course there was all the follow up with the urologist getting the stent removed, filling the gallon jug with pee for 24 hours, putting me on meds that gave me panic attacks, loads of fun. Finally told him to take a hike.

No problem since. I do take this every now and again to hopefully prevent it. Which reminds me, I think I will go take some now. Does it work? Danged if I know but I have not had any problems return.

Chanka Piedra