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Our pool is a little less than an year old. It was finished last July. We live in Mississippi and left it running all winter. Being a new pool owner, I did not test the water much over the winter and some of the levels got off. My numbers when I first checked this spring were: FC 0 CH 150...

Hello, new pool owner here and I need help to determine what these lines and spots are in our plaster. The round dark spots are mainly in the deep end. The thin lines are in our shallow area mainly. I think the round spots are black algae. I do not know if the line like formations are a...