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What do water well drillers use to seal the hole from contamination outside the culvert?

April 26, 2017contamination culvert drillers hole outside seal water

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What do water well drillers use to seal the hole from contamination outside the culvert?

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They use bentonite. If you are not in an area that requires a licensed driller, it would be a good recommended practice to use bentonite to make this seal to prevent contamination from surface water.