Bio-Dex Skill-It AlgaecideThe Bio Dex Skill It Algaecide product is a necessary tool in fighting and protecting against common resistant forms of algae. This product is non metallic, so it will not stain the pool while effectively removing unwanted algae from it. Skill It does not affect the pH chemistry of your water, and can be added directly to the water or through water circulation equipment. Eliminates and protects against common resistant forms of algae Not metallic