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What are the black spots on the walls and floor of my pool?

April 26, 2017Black floor pool spots walls

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What are the black spots on the walls and floor of my pool?

1 Answer

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This is most likely Black Algae. This can be removed by a chemical treatment of the water but it will return if you allow the water chemistry to go out of balance. If you have black algae you should have your pool serviced by a water chemistry professional.