A device or machine that adds chlorine to water, typically used in swimming pools and water treatment systems.
From 'chlorine' plus the suffix '-ator' (meaning something that performs an action). It's the mechanical version of the verb 'to chlorinate.'
Chlorinators are one of the most important public health inventions—they killed bacteria in water supplies and prevented diseases like cholera, but the chlorine smell people associate with pools wasn't really necessary or healthy at high levels!
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