back-wash

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or back-flush

to pass a fluid through a chromatographic column in the direction opposite to that of the eluent flow. It is useful, e.g., to relieve bed-compression and to remove entrained gas.

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Cent Briques et des Tuiles (1965 Comedy Film)
The Grimmrobe Demos (2000 Album by Sunn)
Things Shaped in Passing (2002 Album by The Six Parts Seven)