Applied Biochemists®
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Black and/or Dark Green Spots

Possible Cause Solution Preventative Maintenance

Black algae

Use 12 fl. oz. of Black Algaetrine® algaecide per 10,000 gallons. (This product is not compatible with biguanide sanitizers.) Brush spots daily until gone. Use Gold-N-Clear® clarifier to remove dead algae.

Add Black Algaetrine® algaecide (6 fl. oz. per 10,000 gallons) weekly to prevent regrowth.