What plant do you want to control? Algae Slimy, Scumy, StringyNo leaves or stems Duckweed & Watermeal Small FloatingGrow FastHard To KillContain Leaves & Roots Coontail, Pondweeds, Naiads Aquatic PlantsContain Leaves & Roots Cattails Shoreline PlantLarge Seed Head Water Lillies Big Leaves Floating On The SurfaceLarge Stem Structure Creeping Water Primrose Aquatic PlantGrows Around Shoreline and “creeps out” Milfoil Submersed Plant“Grass Growing Under Water” High Nutrients Farmland runoffSediment Runoff Discolored Water Murky, CloudyBrown Water Not Listed Get this one over to an expert.