Refreshing and delicious water guaranteed. This is achieved with Grohe Blue and the Grohe Blue activated carbon filter. It has been designed for regions with water hardness below 9° dKH. The intelligent three-phase filter has a capacity of 3000 liters and removes all unwanted substances and impurities. First, coarse particles like dirt are filtered out. The activated carbon filtration removes unpleasant-tasting substances, thereby refining the taste of the water. Finally, the fine filter captures even the smallest particles. The filter is easy to replace.