A water filter provides good tasting, potable water without chemical biocides. A water filter utilizing activated carbon to rid the water of undesirable chemicals and the like has dolomite added to the activated carbon. The dolomite acts as a nutrient for harmless bacteria and thereby promotes the growth...http://www.google.fr/patents/US5198114?utm_source=gb-gplus-shareBrevet US5198114 - Dolomitic activated carbon filter
