The stylish Brita Glass Kettle has a built-in Brita water filter system that reduces limescale and chlorine, it also absorbs any copper and lead that could occur in tap water. To make sure every litre of water you boil remains pure, there is a handy built in digital alert to remind you when the cartridge needs to be replaced. Enjoy your cleaner, clearer, better tasting coffee and tea. As the temperature rises, the water is infused with soft blue light which illuminates at its brightest when boiling point is reached.