Is “Backwashing” a Scrabble word?
Yes
BACKWASHING
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Backwashing
noun
1.A form of water treatment in which water is pumped backwards through the filter media, sometimes with intermittent use of compressed air.