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Help! - Black Algae Problem

16 years ago

Can anyone recommend a treatment for black algae? I have two somewhat large (3x3') spots of black algae in my pool (guinite with plaster) that I can't seem to get rid of. I have dosed it 2 days in a row with "Black Algae Killer" at recommended dosage and it doesn' seem to be doing a thing. Is there anything else I should try or do? Any advice appreciated.

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