Keep us informed as time goes on how the bentonite works. Unless you are tilling it into the ground in the whole basin of the pond, then compacting the basin, past history of people here on the forum is that it doesn't work long term.

The amount of bentonite needed per square foot varies with soil composition.

Check with the well drillers in the area for bentonite. They use it for well drilling to make a slurry to keep sandy soils from collapsing when wells are drilled before the casing is installed.

Depending on the amount needed, you might be able to get pallets shipped in via truck from South Dakota & Wyoming, where it's mined. You are looking for Sodium Bentonite, which expands when it gets wet.

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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).