Gordon's PondMaster 7371073 Aquatic Herbicide, Liquid, Dark Violet, 1 gal

Copper-based herbicide that provides faster uptake than other copper herbicides. Herbicide controls weeds that choke the life and good looks from lakes and ponds. Treated weeds sink below the surface in 3 to 7 days. Labeled for the control of American pondweed, Hydrilla, Brazilian Elodea and other common aquatic weeds. Immediate access to treated water. No holding periods or re-entry restrictions. Effective in hard water. Non-corrosive to spray equipment.