The limescale protection cartridge was specially developed by Laurastar's Swiss engineers and makes it possible to filter tap water for ironing. Thanks to the limescale protection effect, it extends the service life of your iron. The salt protection effect improves the steam quality. The anti-rust effect keeps the components of the steam generator in good condition. The limescale protection cartridge must be replaced as soon as the limescale protection granulate has turned completely brown. Please note that the matching filter insert is required to use this cartridge.