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Can control weeds up to one full year Sonar controls target weeds in almost any body of water. It usually takes 30 to 90 days for Sonar to work. Susceptible plants absorb Sonar through their leaves, shoots and from roots. Within a short period (seven to ten days) injury symptoms begin to appear. Susceptible weeds will start to show chlorosis, a deficiency of green pigment. Sonar’s selectivity lets desirable aquatic plants become reestablished. Won’t restrict swimming, fishing or drinking, even immediately after application! Rates depend on target species and habitat conditions. As always, follow label rates and restrictions.