EasyPro Sonar Herbicide is a specialized herbicide that controls almost all aquatic weeds. This 41.7% Fluridone product is excellent for whole pond and lake treatments. A selective systemic aquatic herbicide for management of aquatic vegetation in fresh water ponds, lakes, reservoirs, drainage and irrigation canals. It is important to maintain the recommended concentration in contact with the target plants for a minimum of 45 days. Sonar should be applied early in the season, prior to or just after plant growth begins. Treatments last for several seasons in many cases, depending on plants. Absorbed by the plants and inhibits the weed’s ability to make food, causing it to die. Initial results can be seen in ten days. Complete kill can take 30 to 90 days.