Reward Concentrated is a broad range herbicide that controls duckweed, coontail, elodea, naiad, pondweed and milfoil. This liquid herbicide is applied by common sprayers and should not be applied to turbid waters. There is very little risk of environmental damage since Reward's concentration rapidly decreases as it is absorbed into the aquatic vegetation. Results often begin to show in as little as three days, five day water restriction. Reward is a restricted use pesticide in the state of Michigan - a copy of your pesticide applicators license must be presented. All other states are not restricted and can be shipped without certification. Application rate is one to two gallons per acre. Should be used with activator for best results.