We found one dictionary that defines the word backwashable:

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1. backwashable: Wiktionary

Definitions from Wiktionary (backwashable) ▸ adjective:  Capable of being backwashed. ▸ Words similar to backwashable ▸ Usage examples for backwashable ▸ Idioms related to backwashable ▸ Wikipedia articles (New!) ▸ Popular nouns described by backwashable ▸ Words that often appear near backwashable ▸ Rhymes of backwashable ▸ Invented words related to backwashable