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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 installed a marble shower wall, and the contractor used an acid to clean it. We had it professionally repolished, but it keeps getting etched after we take a shower. What’s causing the etching and how do we correct it?

I will assume you are not cleaning it with acid cleaners. There is a possibility that there is some residual acid in the grout or the pores of the stone that bleeds out when you take a shower. Try rinsing the shower wall with a solution of baking... Read More

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