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The word Backwash may refer to:

  • Backwash (physical phenomenon), also known as 'swash', the backwards flow of air or water
  • Backwash ileitis, the involvement of the terminal part of the ileum in ulcerative colitis following the ascent of the condition from the rectum
  • Backwash, the process of thoroughly cleaning a pool filter pump by reversing the flow of water through it with the dirt and rinse water going to waste
  • "Backwash" (The Wire), a 2003 episode of the HBO television series The Wire
  • Backwash (album), a retrospective compilation by the group Talulah Gosh
  • Backwash, a 2010 web series starring Joshua Malina, Michael Ian Black, and Michael Panes and featuring many celebrity cameos, distributed via Sony's Crackle
  • Backwash, a type of squeeze play in bridge