Certified by the National Sanitation Foundation International, Brita water filters contain a mesh screen to catch sediment and particles as tap water flows through into the pitcher's basin. Brita pitchers employ an ion exchange resin with activated carbon granules to draw mercury, zinc, copper and cadmium from tap water, trapping these harmful elements inside the filter. Brita filters eradicate up to 98 percent of the lead found in tap water while significantly reducing other impurities and dangerous bacteria including cryptosporidium, giardia, and benzene. Additionally, the odor and flavor of chlorine are removed from drinking water. Brita filters should be replaced every 40 gallons or after two months of use. Replacement filters can be purchased separately. Wash the Slim Pitcher by hand in lukewarm water with a mild detergent. Brita offers a limited 90-day warranty on pitchers in the event of manufacturer defects. The pitcher weighs two pounds upon shipping. --Jessica Reuling