Hi! I have posted before about my pool having to be re-plastered just a year after it was complete due to a divot being left at the bottom of my deep end. Anyway, today we are drain our pool to below the light because the light needs to be replaced. And this is what our plaster looks like. It is blue and dark grey. We do not cover our pool. It is not open yet. We do brush regularly even in the winter. Does anyone know what this is, how to fix it and how to prevent it? Thanks in advance.
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