backwash

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backwash

The reversal of the direction of a usual pattern of flow.
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References in periodicals archive ?
The filter media cleaning test requires that after a challenge slurry is introduced into the filter, it should be backwashed per the manufacturer's requirements and after performing this test, the head loss across the filter is not to exceed 150 percent of the initial head loss as determined during a head loss test.
The GAC in a water filter is initially backwashed to segregate the granules.
When this is complete, the air is turned off and the filter is backwashed at 15 to 17 gpm/sq ft for 10 to 15 minutes to wash all removed particles from the filter.