Pond Logic Ultra Pondweed Defense, 1 gal Controls Aquatic Weeds. Cannot be shipped to: AK, AZ, CA, CT, DC, HI, ME, NJ, NY, PR, RI, VT, WA and Canada Contact Herbicide Controls Submerged Pond Weeds Fast Acting Results 1 Gallon Treats Up To 20,000 Sq Ft