Aquathol K is one of the most versatile and effective aquatic herbicides ever developed. It’s an excellent Aquatic Habitat Management tool that can provide season long control of a broad spectrum of submerged weeds often found in small lakes and ponds. Aquathol K is not toxic to fish or other aquatic organisms and has a relatively short half-life in the water. Aquathol K provides control of aquatic weeds in a relatively short time, generally 3-4 weeks, and can provide long-term control depending on the application timing and the target species. No shipment to AK, CA, CT, ID, HI, ME, MA, NH, NJ, NY, RI, VT, WA & Canada.