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Selective Herbicide is formulated to control water milfoil, water stargrass, bladderwort, white and yellow water lily, water shield, water chestnut and coontail. Water use is restricted for non-turf irrigation and drinking (human consumption), see label for details. Active ingredient is 27.6% butoxyethyl ester of 2,4-Dichlorophenoxyacetic acid. Application rate varies by species and water depth between 100 and 200 pounds per surface acre (or 5 - 10 pounds per 2000 sq.ft.).