grey stain eats diamond brite to concrete?

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grey stain eats diamond brite to concrete?

Postby ligthart » Tue 27 Mar, 2007 18:24

Have a gunite pool with diamond brite surface. Found brown stains and corrected them with simple pool solutions. However, I also have grey stains that eats the diamond brite. Thought it was a surface stain, but now one of the stains has eaten the diamond brite down to the concrete? Two more grey stains are doing the same thing? It is a slow process, but I can't stop it? Grey areas become soft. All grey stains are by the pool steps on the bottom.

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