We had our pool plaster redone last year and it was perfectly smooth. The pump went out to start the winter and by the time I got it fixed, the pool had went so i just let it go for the winter. Now its developed this really abrasive scale that will take skin if you rub up against it. I drained it a little to test a spot, poured some Muriatic acid on it and it fizzled. The color came back but it is still rough. Scubbed it with a algae brush but it didn't cut it that much either. Is there a way to improve the smoothness of the surface that doesn't involve draining?
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