Sonar Q Granular - Systemic Herbicide for Controlling Weeds 

Sonar Granular with fluridone is a systemic herbicide for controlling weeds in fresh water ponds, lakes, reservoirs, irrigation canals and drainage ditches. Sonar provides excellent control of many difficult to control weeds, while allowing desirable vegetation to remain.More - http://www.killlakeweeds.com/products/sonar-granular