Chemical Used to Keep a Pool Clean
This page is the CodyCross answer for the clue below from Greece, Group 662, Puzzle 2 (Rugged Mountains).
Question is: Chemical Used to Keep a Pool Clean
and the answer is: CHLORINE
Word Meaning:
CHLORINE — A toxic, green, gaseous chemical element (symbol Cl) with an atomic number of 17.
Definitions from Wiktionary.