Descaler

Part of speech: noun

Definitions

1. A chemical product or apparatus used to strip away the hard mineral scale that builds up inside pipes, boilers and kettles
2. Any agent or tool that clears away the limescale and mineral crust forming on surfaces exposed to hard water
3. Something applied to dissolve or scrape off the chalky mineral deposits that accumulate in plumbing and heating equipment

Etymology: "Descaler" is a plain formation: the verb "descale," meaning to remove scale from a surface, with the suffix "-er" attached to name the agent, the thing or person doing the removing. Scale in this sense is the hard mineral crust, often limescale, that builds up inside kettles, pipes and boilers, and a descaler is whatever product or device is used to dissolve or break it up. The word is a transparent compound of familiar parts rather than a borrowing or a coinage with a famous backstory. Its meaning follows directly from its parts, so there is no surprising shift to report. The useful thing to know is how it works: "descale" takes the older "scale" in the sense of a layer that flakes off, and the "de-" prefix reverses it, so "descale" means to strip that layer away, and "descaler" is the noun for the agent that does so.

Synonyms: descaling agent, decalcifier