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We have a large water fountain in our hotel lobby made of coral stone. the problem we have is that there is a copper basin that holds the water. The copper is causing the coral stone to turn green and we are finding large green and white, hard deposi

The hard, green deposits you describe is a combination of calcium deposits from the water and copper from the basin. The easiest way to remove them is to use a pressure washer. Be sure to test the pressure washer on an inconspicuous area, since too... Read More

We have Italian marble on the lobby floors in our commercial office buildings. Recently, we have noticed several problems: 1. Entire tiles are evenly discoloring yellow or grey and 2) Rust-like stains are appearing in an area near the door. What

The yellowing and graying of certain Italian and Greek white marbles is a common problem that I see all over the country. There are several possible causes for this condition: Maintenance technique-Take a close look at your maintenance program. Are... Read More

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