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I just tried the fingernail test (thank you for pointing me that way) and nothing came off at all. I guess the pool guy was correct and it is just the cement starting to show through.

I am a new pool owner in Chicagoland and after having kept my pool up to snuff the majority of the summer, these recent storms have me reeling. I think I am dealing with some sort of black algae but after brushing, shocking and using algacide, and brushing lots more, it is still there. I had a...