present participle form: the ongoing process of purifying or cleansing of impurities.
Present participle of 'depurate,' formed by adding '-ing' to the verb stem. This turns the action into an ongoing process or gerund that can be used as a noun.
Adding '-ing' creates a wonderful ambiguity—'depurating water' could mean 'water that is being purified' (present participle) or 'the process of purifying water' (gerund), showing how English reuses its grammatical tools!
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