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it's been a while since I have researched using bentonite, did a quick google and found this, seems like there is 3 different ways to use it

Application Methods

Bentonite can be applied to ponds using a few different methods. Among these are sprinkling, mixing with the native soil, and blanketing.

Sprinkling

Bentonite can be “sprinkled” into the water near areas suspected of leaking in an effort to seal them off. This is rarely effective because of the high probability that the bentonite will not land in the area of the leak.

Mixing in with Native Soil

Bentonite is blended with soil on-site to amend the quality of the soil to reduce water seepage or leaking. In order to determine the amount of bentonite necessary for this method, you will need to have your soil analyzed by a soil lab (typical blend is about 5%-10% by weight bentonite/native soil). Once the analysis is complete, you should receive direction on the percent of bentonite necessary to create a seal. This method has a much higher rate of success than the sprinkling method.

Blanket

Bentonite can also be applied as a blanket over an existing pond surface. Bentonite is typically applied 1" to 4” thick and then covered with a protective layer of soil. Once installed, the entire site will need to be moisturized and compacted.