The process of removing chlorine from something, like water or a chemical compound, to make it safe or pure.
From the prefix 'de-' (removing) combined with 'chlorinate' (adding chlorine). The term emerged in chemistry in the early 20th century as water treatment became important for public health.
Dechlorinating is why your pool water tastes gross if you don't remove chlorine properly, but it's also critical for treating wastewater before it returns to rivers—removing the exact thing we added for safety in the first place!
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