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This was forwarded to me:

Any water or oil driller uses Bentonite to lubricate their drills. Just be sure to ask for pure/straight Bentonite versus additives added. I just stopped by a driller and picked up a 50 lb. bag for around $7. The food grade is more expensive, but I keep it around for internal problems when they crop up. I use the pure Bentonite for bathing and poultices. Hope this helps. Tweet