The Sapphire Water Filter reduces impurities in tap water while improving the taste, smell and clarity. It is an economically intelligent and environmentally friendly alternative to buying bottled water. These water filters are made to fit all Brita pitchers and water dispensers and come in packs of 3 or 4. Sapphire Water Filters remove Copper, Mercury and Cadmium from water and reduce the chlorine taste and odor to deliver great tasting water.