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The word Backwash may refer to:

Physical phenomena[edit]

  • 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
  • Backwashing (water treatment), 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

Arts, entertainment, and media[edit]