Answer: chlorine

AnswerCrossword Clue
CHLORINE

Pool room emanation

CHLORINE

Table salt component

CHLORINE

Green gas

CHLORINE
Powerful oxidant
CHLORINE
Pool necessity
CHLORINEIt's added to the pool
CHLORINEPool additive
CHLORINESwimming pool additive
CHLORINEWater additive
CHLORINEWater purifier
CHLORINEIts name is derived from the Greek for "pale green"