Reduces chlorine (taste & odor), mercury, copper, cadmium and more (see certifications). The No. 1 filter (based on IRI sales data). Patented aeration design ensures consistent flow of water. Built-in mesh screens prevent black flecks. Ion-exchange resin helps to reduce impurities in your water. Fits in all Brita systems except Brita stream systems. Activated carbon reduces chlorine (taste and odor). The Brita standard filter keeps a healthy level of fluoride, a water additive that promotes strong teeth (applies to fluoridated municipal tap water). The contaminants or other substances removed or reduced by this water treatment device are not necessarily in all users' water. The Brita standard filter is not intended to purify water. Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system. Recycle your Brita filters. Visit brita.com/recycling to learn how. A better planet starts with a single drop (replaces up to 1,800 standard 16.9 fl. oz. (500 mL) single-use water bottles each year).