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backwash |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.02 sec. |
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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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Backwashed water may also be used for irrigation purposes, but Jeanette Smith, manager of standards at NPSI, advises checking with local health departments for any disposal restrictions. With pressure diatomite earth filters, for example, when backwashed, the operator might assume that when the sight glass is clear, the filter elements are clean. When saltwater pools are drained or when their filters are backwashed, they put a salty waste into the sewer system. |
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