[permaculture-oceania] bentonite

[irene rosemary]

Hi.
we are building a home for our frogs. Its 12mx8mx900mm.one very large hole in our backyard.we now need to seal it.we have decided to use bentonite.however we have not been able to find any information on the product.we need to know how much to use per square metre ect.can anyone help?
Many thanks.
Rose n james
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