So it is best to exchange the filter if it clogs, Irrespective of how long it has been installed. How long do below-sink water filter systems last? 15- twenty years with proper routine maintenance. Suppliers advocate which the sumps or human body of filter housings (if expected) be replaced http://ericksbduv.ampblogs.com/The-best-Side-of-home-water-system-blog-29327112