If you want to concentrate on targeting the watermeal, use Clipper. You might have to treat a few times because it won't affect the seeds that are in the pond. Once those seeds germinate, re-treat before they can re-seed.

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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).