To remove carbon dioxide or carbonate compounds from a substance, particularly in water treatment or chemistry.
From the prefix 'de-' (remove) plus 'carbonate' (a salt containing carbon and oxygen). A 20th-century technical term born from the need to describe industrial processes.
Water decarbonation is why aquariums need special equipment—removing carbonate buildup prevents that white crusty coating on rocks and keeps pH levels stable for fish!
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