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Black and/or Dark Green Spots

Possible Cause Solution Preventative Maintenance

Black algae

Use Oxy-Brite® non-chlorine shock oxidizer per directions. Add Algimycin® 3000 algaecide or Algimycin® 2000 algaecide as directed and then brush pool surfaces daily until algae is gone. Use Drop N’ Vac® flocculent to help remove dead algae.

Use Algimycin® 3000 algaecide (6 fl. oz. per 10,000 gals.) weekly.