The BRITA Maxtra filter cartridge with the unique Maxtra 4-Step Filtration has +20% improved limescale reduction compared to the BRITA Classic cartridge*. In addition to that, it reduces other substances such as chlorine, which affect the taste and odour in your tap water, reduces aluminium and certain heavy metals (like copper and lead) along with certain pesticides. Organic impurities are also reduced. The result is cleaner, clearer water for great tasting hot and cold drinks, delicious food and less limescale build up in your domestic appliances.