The BRITA Classic filter cartridge reduces limescale and other substances such as chlorine which affect the taste and odour in your tap water. Furthermore it reduces aluminium and certain heavy metals (like copper and lead) and certain pesticides (like diurone). Organic impurities are also reduced. The result is cleaner, clearer, great tasting water for hot and cold drinks, and for delicious food. You will also have less limescale build up in your domestic appliances.