What is the black stuff on the walls and floor of my pool?

This is only common in marbelite pools and it is most likely black algae.

Cause of black algae: Usually caused from humid temperatures, Hot water from solar systems, blankets or heat pumps and salt.

Once your pool has black algae it is a menace to eliminate however we have found that draining the pool and acid washing it takes care of this terrible algae.

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