When was this clue last seen?

This clue last appeared in the NYT Crossword on Tuesday, 01 November 2022.

Big name in water purification

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Keywords

purificationwatername

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This clue appeared in the NYT Crossword on Tuesday, 01 November 2022. The answer ECOLAB is a 6-letter entry.

What is the answer to "Big name in water purification"?: ECOLAB
How many letters is the answer to "Big name in water purification"?: The answer has 6 letters.
When was this clue last seen?: This clue last appeared in the NYT Crossword crossword on Tuesday, 01 November 2022.
Has this crossword clue appeared before?: This appears to be a rare or unique clue.

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