Enjoy greater peace of mind about the water you drink at home. Keep your KOHLER® Aquifer water filtration system flowing with this single replacement filter cartridge. The 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. Kohler® Replacement Filter Cartridge, 3-1/8 in Length, 10 in Height, Plastic