Without tilling in and compacting the bentonite, I don't know how effective it will be. I think there's different forms of bentonite to be used in water vs. tilled into the ground. Has he had success using bentonite in ponds that had that much water in them?

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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).