GROHE Blue 2 is a system supplying filtered and chilled drinking water directly from the kitchen faucet. Choose between non-carbonated, slightly carbonated and fully carbonated water. The twist grip has an LED indicator showing a different color for each type of water. A flashing light indicates that the filter cartridge needs to be exchanged. A separate pipe in the faucet supplies unfiltered tap water that can be accessed at anytime using a lever.