Durvet AquaVet Submerged Weeds is a landscape and aquatic herbicide designed for fast control of surface and submerged pond weeds. It effectively burns off duckweed, watermeal, milfoil, and other pond weeds. For best results, mix with a non-ionic surfactant or combine with AquaVet Algae Control for enhanced effectiveness. One quart mixed with 25 gallons of water plus 8 oz of surfactant treats 10,000 sq. ft. of surface area. Apply to clear, calm water to manage excess aquatic vegetation interfering with recreational use.