# backwashing

> English word · Noun

## Definitions
1. A form of water treatment in which water is pumped backwards through the filter media, sometimes with intermittent use of compressed air.

## Etymology
From back + washing.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/backwashing