Does the plastic casing need to be removed while digging the borewell?

Hi,

I have dug a borewell 760 ft deep and found some silt at 270 ft and 600 ft. A plastic casing has been put throughout the depth of the borewell. In case I want to dig the borewell a few feet deeper then do I have to remove the plastic casing?

Regards
Praveen

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