Enjoy greater peace of mind about the water you drink at home. Keep your KOHLER® Aquifer water filtration system flowing with this two-pack of replacement filter cartridges. 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