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Yellow Out® safely destroys all strains of algae including green, brown, pink and mustard algae in 24 hours without harsh chemicals that can stain or damage the surface of your pool. It dissolves instantly with no brushing required!
After adding Yellow Out®, an oxidizer must be added to activate this chemical. You can use chlorine, bleach or a non-chlorine shock.
Safe on plaster, fiberglass or vinyl pools, as well as pools with salt generators.