Valved Surge Block

What is it?

Surge blocks. A surge block acts like a piston in the borehole 'cylinder'. It is
mounted on a drill stem and gently moved up and down. The surging action
draws fine material and any remaining drilling fluid from the aquifer. This debris
is removed intermittently with a bailer. The figure shows a typical surge block,
but any close fitting tool, such as a bailer, can also be used. Care should be exercised
when using a surge block as vigorous use can damage a lightweight screen.

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