Crossword Genius

Makes water safe to drink and swim (8)

Ross

I believe the answer is:

chlorine

(Other definitions for chlorine that I've seen before include "It's used to purify water" , "It's used to purify a swimming pool" , "Green gas, element" , "Yellowish-green gas" , "Atomic number 17" .)

I've seen this clue in The Irish Times.
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