I know of someone that used Sonar in front of their house to treat Eurasian Water Milfoil. The one application worked for 3 years before it started encroaching in that area. (no, that someone isn't anyone related to me)

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).