We had an exterior water feature installed a couple of years ago. The surface of the fountain is usually underwater when the pumps are running. It has an infinity edge and when the system shuts down, the vertical surfaces dry. We use a bromide to control the algae but we have noticed that there is a discoloration in the polished marble slabs, looks like some type of scaling. We have tried brushes but have been skeptical to apply a scale remover. Is there a product that can be used safely that will not damage the finish of the stones? There is no way of keeping the chemical from entering the mechanical system of the fountain as well, which uses stainless steel, bronze and copper. Thanks for any insight. Darren Hutchison.
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