John, 

You could also scrub clean the floor first to wash away the loose sanded grout and then follow polishing steps. The hardness of the stone may also dictate how much damage the sanded grout causes. 

On Jan 7, 2013, at 8:45 PM, Randy Frye <rfrye@comcast.net> wrote:

The synthetic diamond pads float well over the grout lines. Just let them know you can try that and if you have a problem with the grout scratch the stone you will need to pull out the sanded grout and re-grout with un-sanded grout and use a latex instead of water for the grout mix. 

Good luck,

Randy, CEI Surface Pros

On Jan 7, 2013, at 7:07 PM, john jackson wrote:

i keep getting calls  on brand new marble installs with sanded grout, where the grouting has scratched the marble..All i know is to flatten and repolish the floors, with maybe regouting the floor. are there other options ?

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