Always. Coffee contains 98% water. In addition to calcium, minerals and fluorides, the mains water in many areas contains traces of lead, copper, aluminium and chlorine. Water quality and water hardness vary from place to place and depending on the time of day. With the pioneering new formula, the filter cartridges are ideally suited to mains water anywhere in the world. CLARIS continuously delivers perfectly and freshly filtered water. It absorbs harmful substances such as chlorine and lead while retaining the right amounts of important fluorides, which help the flavours to really develop. This optimum water quality makes every cup of coffee a full-bodied taste experience.