Any quick input on this one would be greatly appreciated....

I have an old lobby slate floor, 1000SF, and successfully removed ugly epoxy coating. When dry, on only certain tiles(20%), there is heavy efflorescence that I have not come across. It is mineral buildup that is very hard.(it barely scratches with a screwdriver) Acid cleaners did not make much of a difference. Grinding the floor would be too much work because of its rough texture, and it would end up flat.

How can I get rid of the buildup? I am thinking of trying a stronger acid, like muratic acid. The only solution I can come up with is possibly antique brushes on a variable grinder? I have no idea how that would work. Shot Blasting with baking soda, but that would be a pain...

Thanks!

Jason

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Marble Glow
Jason Francis
Sales / Lead Stone Pro
www.marbleglow.com
333 Norton Road
Red Hook, NY 12571
718-514-7343 NYC 

845-208-8289 Upstate