Black Algae Spots

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I have a 10K gallon in ground pool with vinyl liner. My metrics are all good, pool is sparkling clear but I have a few spots of black algae in the deep end. I’ve tried everything to no avail. Now, I laid a chlorine tab

over the spots and in no time they are gone. However, the next day there back! Any help would be more than appreciated. Thanks

Ask the Pool Guy Changed status to publish August 7, 2018

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