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Hydrothol Granular Aquatic Heɾbicide AND Algαecide Hydrothol Granular acts as both an heɾbicide and algαecide, making it an excellent choice for pond owners. Hydrothol reacts quickly once applied to ponds with actively growing algae and weeds. Treats up to 10,000 sq ft Active Ingredient: Mono Salt of Endothall 11.2% Should NOT be used in ornamental ponds, or ponds with Koi or Goldfish. Cannot be shipped to AK, CA, CT, DC, DE, HI, MA, ME, NJ, NY, RI, VT, WA
