Pond Logic Algae Defense Algaecide, 1 Gallon Do NOT Use in Pond or Lakes with Koi, Goldfish or Trout. Cannot be shipped to AK, CA, CT, DC, HI, ME, NJ, NY, PR, RI, VT, WA and Canada. Fast Acting Liquid Aquatic Algaecide Eliminate Floating, Chara and Suspended Algae 3' Deep or Less 1 Gallon Treats Up To 8,000 sq ft.