All BRITA water filter jugs use the MAXTRA+ filter with the unique MicroFlow technology, which is formulated to provide expert levels of filtration for different water conditions. Made of activated carbon from natural coconut shells, its activated carbon pearls act to absorb and lock away chlorine and other taste and odour impairing substances, resulting in fresher, cleaner water. Additionally, its ion exchange pearls help to reduce metals like lead and copper as well as ensuring reliable protection from limescale build-up. The in-built electronic indicator is designed to remind you when the filter should be replaced - for optimum performance, the filter should be changed every 150L or 1 month (based on average household size drinking 8 glasses per day).