In short, yes.... but it isn't pleasant. To explain, limescale (calcium carbonate) is a milky white, tough deposit that clogs up the filaments of your kettle and forms when hot water has evaporated and solidified. As well as looking unappetizing when it appears as flakes floating in your hot drink and giving your boiled water a slightly metallic tang to it, limescale can be stubborn to remove by scrubbing alone.