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The Clue

Pool necessity (8 letter answer)

The Answer

CHLORINE

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Notes

The answer CHLORINE is so rare that it appears less than once every 2500 puzzles.

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Definition

CHLORINE as a noun:

1. (chlorine, Cl, atomic number 17) = a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water)