The Claris smart filter is for use with Jura coffee machines that have the smart filter in the water tank. The smart filter removes limescale to an optimum level and also reduces other harmful substances, traces of chlorine, copper and aluminium, keeping just the minerals that are important for optimum water quality. Using RFID (radio frequency identification) the coffee machine can detect when the smart filter is inserted and activates the appropriate mode and also alerts the user when the filter needs replacing. Suitable for use with coffee machines using the I.W.S system.