- - element that is a greenish gas at room temperature; used as a disinfectant
- - Gas that could make Noel rich
- - Halogen gas, Cl
- - Chemical used as poison gas and water supply disinfectant
- - Yellowish-green gas
- - Its name is derived from the Greek for "pale green"
- - Green gas
- - toxic, irritant pale green halogen gas, atomic no. 17
- - children learning about essential part of mine, toxic gas
- - Chemical used to clean water
- - Pool water additive
- - element added to swimming pools
- - Makes water safe to drink and swim
- - It's used to purify swimming pools
- - smell familiar to swimmers
- - Pool chemical
- - Bleach ingredient
- - CL*
- - It's used to purify a swimming pool
- - Algae-killing chemical
- - Swimming pool additive
- - Powerful oxidant
- - Table salt component
- - It's added to the pool
- - Water purifier
- - Pool room emanation
- - Pool additive
- - Water additive
- - Gaseous element
- - Pool necessity
- - Bleaching agent
- - Element of distress at the heart of chronicles
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