This AVAIL 1019 is a high-efficiency, 1.28 GPF DuPont CCN water filter. It is designed for use in residential applications and is compatible with most standard faucets. This filter is made with DuPont's patented Tri-Clad technology, which helps to reduce the amount of chlorine and other contaminants that are found in water. This AVAIL 1019 is a high-efficiency, 1.28 GPF DuPont CCN water filter. It is designed for use in residential applications and is compatible with most standard faucets. This filter is made with DuPont's patented Tri-Clad technology, which helps to reduce the amount of chlorine and other contaminants that are found in water.