Delta Water Engineering’s Delta Ontario hydraulic water softeners feature bigger resin volumes (0.42 cubic feet), vessels equipped with two 80-micron filter screens, triple-brine valve security, volumetric controls and a standard 0.75-inch (19.05 mm) valve. Benefits of the non-electric units include low salt and water consumption, up to 14.4 gpm (54.5 L/m) flow rates and up-flow regeneration. http://www.deltawatersystems.com