So my husband and I have a slight disagreement on the surface of the pool walls. I think they have been plastered at one time or another. He thinks the only thing coating the walls is the paint. The pool was probably built in the early 70's. It is obvious that basalt building blocks were used. And the bottom is cement. Not surprising given that we have learned he had a cement business. The steps we agree have been plastered. Is there a way to determine the wall coating without doing any more harm to the pool than the last 10 years of neglect have caused?
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