Sanco Industries Crystal Plex - Aquatic Algaecide Algae Control - 1 Gallon Controls many types of algae like filamentous, chara, planktonic and swimmers itch for a beautiful and safe pond all year long When used as directed, Crystal Plex is 100% safe for humans, fish, livestock, pets, birds, swimming and irrigation One gallon treats 1 surface acre 1-3 ft deep Long term algae control, uses our proprietary stabilizers Not for use with Koi, Trout or Goldfish