As tap water travels through miles of infrastructure it has the potential to pick up impurities along the way. Fortunately, the refrigerator water filter can serve as the last line of defense against unwanted contaminants, such as lead and mercury that can be found in some – but not all – tap water sources. Even more, by using two filters a year, refrigeration systems can filter the equivalent of 3,000 bottles of water annually, which means you can reduce waste and save up to $600 a year versus purchasing leading brand bottled water (based on average use of two 6-month 200 gallon filters). For the freshest drinking water, Whirlpool Corporation recommends changing the filter every six months – and most are conveniently located at the bottom in the grille or just inside the refrigerator, in the top right corner. For more, visit http://www.whirlpool.com/waterfilters.