Enjoy greater peace of mind about the water you drink at home. Keep your 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-up coconut shells, making it more eco-friendly. Kohler® Replacement Filter Cartridge, 3-1/8 in Length, 10 in Height, Plastic