Backwashing

[water treatment] Filters are employed to remove particles from liquids. Water treatment filters that can be backwashed include rapid sand filters, pressure filters and granular activated carbon (GAC) filters. Diatomaceous earth filters are backwashed according to the proprietary arrangement of pumps, valves and filters associated with the ...
Found on http://en.wikipedia.org/wiki/Backwashing_(water_treatment)

Backwashing

Reversing the flow of water back through the filter media to remove entrapped solids.
Found on https://www.encyclo.co.uk/local/20094

backwashing

the process of cleaning a rapid sand or mechanical filter by reversing the flow of water.
Found on http://www.chemicalglossary.net/definition/188-Backwashing

backwashing

the process of cleaning a rapid sand or mechanical filter by reversing the flow of water.
Found on http://www.hach.com/chemGlossary

Backwashing

The washing of dyed or undyed wool sliver before or after gilling and/or combing.
Found on http://www.sheepusa.org/
No exact match found