I know the literature is full of using bentonite as a conductivity
enhancer. I wonder if there are other substances that may be more
readily available in smallish quantities that would work as well.
Bentonite is mined by the thousands of tons, and has lots of industrial
uses (drilling mud, cat litter, impervious clay liners for ponds, etc.).
And when people were looking for something to dump into the hole with
the ground rod, they probably had it around, so that's what got used.
I assume it's cheaper than concrete (if for no other reason than you can
deliver it in a dump truck, as opposed to a mixer truck, and it doesn't
have a very short "shelf life" after mixing).
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