Backwash

Backwash may refer to:

Physical phenomena

 * Backwash (physical phenomenon), also known as "swash", the backwards flow of air or water
 * A mixture of beverage and saliva that has flowed back into a drinking vessel
 * 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

 * Backwash (album), a retrospective compilation by the group Talulah Gosh
 * "Backwash" (The Wire), a 2003 episode of the HBO television series The Wire
 * Backwash squeeze, a type of squeeze play in bridge
 * Backxwash, Zambian-Canadian rapper and producer