If there isn't water inflow for the time required for the Fluridone to work, then I'd go with it, and make sure that I kept the 90 ppb dosage rate for 45 days.

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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).