Feel confident with every sip that you are getting nothing but the best for you and your family. The KOHLER® Aquifer two-stage water filtration system effectively reduces contaminants including bacteria, virus, lead, mercury, chlorine and pharmaceuticals in your cold water. While many other systems use coal-based media filters, Aquifer uses two recyclable filters: a carbon block filter made of ground-up coconut shells and a filter made of hollow fiber membrane. Under-sink installation is fast and easy, and the compact Aquifer+ system fits alongside garbage disposals and household items stored below the sink.