Usage patterns
〈物〉に塩素を加えるto add chlorine to something
Chlorine is added to tap water to disinfect it.
塩素で〈物〉を消毒するto disinfect something with chlorine
The pool water is disinfected with chlorine.
塩素の匂いがするto smell of chlorine
There was a smell of chlorine coming from the pool.