Use a glyphosate based herbicide that is rated for pond use. Shore-Klear, Refuge. Add an ounce or two of non-ionic surfactant to every gallon of tank mix. follow mixing instructions on the label for the herbicide.

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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).