Bead blasting tiles?

I'm having some difficulty cleaning some very VERY stubborn calcium tile staining emanating from a rockfall. I used acid, but had to use so much to get the job done that it partially consumed some grout. This time around I'd like to try bead blasting since I have access to a portable blaster. There are services in town that do just this, so I figure it will work, but I'm conerned about the proper way to go about this. I've heard that bead blasting can ruin glazed tile? Any suggestions?

Bumping this back up to see if somebody can help you with your question.