Black (blue-green) algae is evident by the formation of dime to quarter size black (or blue-green) spots, tenaciously adhering to the pool's surfaces and equipment.  Black algae forms a layered structure where the first layers, which may be killed by chlorine, protect under layers from further destruction.  Black algae, like mustard yellow algae is also chlorine resistant.

Treat Black algae using the following products:

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