What are some opposite words for activated sludge?

Antonyms for activated sludgeac·ti·vat·ed sludge

This page is about all possible antonyms and opposite words for the term activated sludge.

We couldn't find direct antonyms for the term activated sludge.

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activatable, activate, activated, activated carbon, activated charcoal, activated sludge, activates, activating, activating agent, activation, activation energy

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Quiz

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Which of the following terms is not a synonym for "Tolerable"?
A constructive
B fair to middling
C adequate
D passable