Skill-it eliminates the majority of resistant colors and types of algae. It does not stain and is non-metallic. It’s a user-friendly product that doesn’t require adjustment to the water pH before applying. Skill-it Algaecide to be an important tool for fighting resistant, persistent algae over the long term. The product can be reapplied if the initial application doesn’t completely eliminate the algae problem. Skill-it Algaecide can be added by itself directly to the pool water or water circulation equipment to eliminate algae.