A possible (but expensive) strategy for successful water- meal control is to kill the surface plants with a treatment of Reward®, and then follow that with a split Sonar® AS treatment to kill the recovering plants.
What kills watermeal?
Clipper is the most effective herbicide for controling watermeal, it also treats a variety of algae and and submerged weeds.
What does reward herbicide kill?
Reward Herbicide requires mixing with a non-ionic surfactant for best results. Reward Landscape & Aquatic Herbicide can control Algae, Bladderwort, Brazilian Elodea, Cattails, Coontail, Duckweed, Elodea, Frog's Bit, Hydrilla, Naiad, Pennywort, Pondweeds, Salvinia spp, Water Hyacinth, Water Lettuce, and Watermilfoils.