Keep your family protected from harmful contaminants with the AO Smith AO-FF Clean Water Advanced Carbon Water Filtration System, a NSF certified water filter suitable for both commercial and household use. This water filter has a 1-stage carbon block filtration method that removes 99% of 77 harmful contaminants, ensuring that you have access to clean and safe water every day. The AO Smith AO-FF Clean Water Advanced Carbon Water Filtration System is compatible with universal brands and models.