Enjoy greater peace of mind about the water you drink at home. The KOHLER Aquifer water filtration system effectively reduces contaminants including lead, mercury, chlorine, and pharmaceuticals in your cold water. While many other systems use coal-based media filters, the Aquifer filter uses ground coconut shells, making it more eco-friendly. Under-sink installation is fast and easy, and the compact Aquifer system fits alongside garbage disposals and household items stored below the sink.