backwash

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backwash

1. a sucking movement of water, such as that of retreating waves
2. water washed backwards by the motion of oars or other propelling devices
3. the backward flow of air set up by an aircraft's engines

backwash

[′bak‚wäsh]
(chemical engineering)
In an ion-exchange resin system, an upward flow of water through a resin bed that cleans and reclassifies the resin particles after exhaustion.
(oceanography)
Water or waves thrown back by an obstruction such as a ship or breakwater.
The seaward return of water after a rush of waves onto the beach foreshore.
References in periodicals archive ?
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.