Anonymous user 28 April 2021 - 11.32 AM
I had a new patio constructed recently with Indian sandstone. After about ten days I noticed white markings starting to appear along the edges of some of the slabs. Also, circular markings have now appeared in the middle of some of the slabs. Can you please advise what could be causing these two effects.
Are you a tradesperson and able to answer this question?
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