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I have a swimming pool terrace in anthracite gray reconstituted stones. There is always a black dust that dirty bare feet and soles of shoes. What should I do? How to clean it? Protect her? Thank you for your help

These gray traces are probably the result of the formation of concrete dust. Because of the anthracite hue of these stones, these traces are particularly visible. The application of a porous pores dust for concrete floors should solve this problem.

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