Tap water in the UK is perfectly safe. However, it doesn't always taste, look or smell as pleasant as we'd like, and the effect can be noticeable not only in drinking water but in hot drinks and food cooked in water. The BRITA Maxtra cartridge uses a mixture of carbon and ion exchange resin to remove hardness, chlorine, heavy metals such as lead and copper, and other organic impurities to improve the taste, smell and appearance of cold and hot drinks. The Maxtra cartridge removes 20% more limescale than the Classic cartridge.Improved lime scale reduction compared to Classic Cartridges Fits new range of Elemaris, Marella & Fjord Cool & XL systems & Brita Partner kettles Convenient ring-pull handle No pre-soaking required.