Copper Sulfate Crystals Algaecide 50 lb. (Fine 20/40 Sizing)

This is 99% copper sulfate pentahydrate (25.1% copper as metallic), a compound used for years as an algaecide. Effective against all forms of algae including: filamentous, planktonic, and branched algae. Crystal form is most effective on bottom mats while the fine crystal may be easily spread or dissolved in water. Copper sulfate is less effective in hard water than chelated copper products. This product is corrosive to metal equipment and toxic to fish in soft water. Effective for control of swimmers itch with special application methods. No restrictions on water usage following application.