Crossword Genius

It's used to purify swimming pools (8)

Ross

I believe the answer is:

chlorine

(Other definitions for chlorine that I've seen before include "Halogen gas, Cl" , "Pale green gas" , "Gas used in STERILISING water and in industry (8)" , "It's used to purify a swimming pool" , "It's used to purify water" .)

I've seen this clue in The Irish Times.
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