Coffee contains 98 % water. So water of the highest quality is essential to creating the best possible coffee result. CLEARYL Pro Smart prevents limescale, prevents chlorine and prevents heavy metals. It features the professional up-flow principle and always filters exactly the amount of water required for each preparation. Thanks to I.W.S.® (Intelligent Water System) and RFID (radio frequency identification) technology, the coffee machine communicates with the filter and alerts the user when the filter capacity has been used up.