The first compartment, ULTRA-FIL/CHLOROSTAT is a self-cleaning whole-house dirt and sediment filter de- signed to reduce the taste of chlorine and odor in the water. These features extend the life of the resin bed, never needing a replacement filter or maintenance. The third WaterMax® compartment, ULTRA-SOFT, utilizes high capacity fine mesh resin. It is vacuum packed for maximum treatment. Compartment three also hosts the self-cleaning Bacteriostat, preventing bacteria growth in the resin bed.