I'm not an expert on bentonite but I don't think there are any. I have never heard of broadcasting bentonite giving satisfactory results. When you toss it out on the surface of the water, it tends to float and go to the sides of the pond. There it sits and does nothing about finding a leak.
I think bentonite has a chance once you identify the source of the leak and apply it to the actual leak.
It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.
Without a sense of urgency, Nothing ever gets done.
Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa
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