Very stubborn algae to eliminate. The Outside layer will protect the inside layer. When you kill the outside layer it is important to brush off the dead algae to get at the protected under layer.
NOTE: Do not use service tools in a contaminated pool and then in a non contaminated pool. You will transfer the algae from one pool to another!
NOTE: The longer that Black Algae has been attached to a surface the more difficult it will be to remove. It will also be difficult to remove from rough or porous surfaces. In extreme cases the pool may have to be drained and the algae physically scraped off.
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