Best way to regrout slate tiles outdoors? Current sand grout peeling
by
Marcos
+13
What you have is the grout efflorescence....
http://www.stoneworld.com/articles/84367-understanding-and-avoiding-efflorescence
Get a really stiff brush and remove it. Ask the mason who did this what cleaner he recommends.
How to Regrout a Slate Floor | Home Guides | SF Gate
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Remove the loose pieces. This can be done using a pressure washer ( this probably takes the least amount of effort), using a wire brush could crelate scratches. Then regrout.
Polymeric sand might work.
Buy the grout in a caulking tube at Lowes or homedepot
It is in the flooring section at Lowes or home depot. It is water proof .
I don't know about the rest of you but this post just showed the picture and had no info on how to do it!