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Black Algae presents in 1 to 3cm black (or dark blue green) spots, It forms in a layers. the first layer may be killed by chlorine but protects further layers from destruction. This form of algae is slow growing and hardy. It is extremely chlorine resistant. to treat Black algae. Turn of the pump,Brush the algae spots thoroughly with a hard brush. then use chlorine tablets to treat the algae spots individually (this is not recommended for vinyl pools). Pour a concentrated all purpose algaecide on the algae spots. Leave it overnight. Restore water circulation, brush dead algae and vacuum it to waste. You may have to repeat the process .when you are finished, check the water balance shock the pool and make sure that you keep the chlorine up to it to help prevent further out breaks.

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Q: What is the best treatment for black algae which is just beginning to manifest in your pool and once controlled how do you keep it from returning?
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