United Phosphorus Inc Hydrothol 191 6020396 Herbicide 20lb. Is a concentrated aquatic herbicide/algaecide effective against a wide variety of submersed aquatic weeds and algae. Please refer to product label for dosage rates and use instructions. We Do Not Ship to AK, CA, CT, DC, DE, HI, MA, ME, NJ, NY, PR, RI, VT, or WA. Orders placed from these states will be cancelled and not fulfilled. Special Shipping Information: This product may not be available for 1 or 2 day shipping due to federal regulations that require it to ship via ground ship methods only. This product can only be shipped within the 48 contiguous states. 20 lb