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 ?
ENGINEERS in charge of drinking water treatment plants will want to learn more about the precise, low-maintenance Triton TR8 turbidity analyser (TA) from Electro-Chemical Devices (ECD), ideal for monitoring turbidity in filter backwashing systems to optimise plant efficiency.
This backwashing solution completely stops loss of sand during processing and there is never a need to replace the sand.
One popular backwashing filter system, RPA's REACTOGARD, provides total protection for catalysts in fixed-bed reactors.
Maiden, MA, has introduced its AF Series Filters with patented backwashing system for applications including inks, metal finishes, paints and cleaning fluids.
It helps save on filter backwashing and chemical usage and can clean the surface of most pools in under an hour.
This arrangement allows a single drain valve to serve the entire multi-element filter, rather than separately controlled valves at each filter element as in conventional backwashing filters.