This patented, premium carbon filter makes PUR the first leading pitcher filter that removes 99% of microbial cysts. It also reduces chlorine (taste and odor) and 96% of trace levels of pharmaceuticals, giving you clean, great-tasting water. Yet it still leaves behind beneficial fluoride. Pharmaceutical reduction is not certified by NSF/ANSI or state standard. Based on manufacturer testing for average reduction in trace levels of 12 pharmaceuticals. May not be present in all users' water.