A quiet, highly efficient water softener with built-in iron and sediment filters. Larger size for big families or extreme hardness. Computerized on-demand regeneration requires only 15 to 27 gallon of water and 3 to 6 lb. of salt to regenerate. Regeneration will take 21 to 38 minutes, depending on the salt setting of the unit. User-friendly controls and low-rise compact housing promote ease of setting softness level, adding salt, and unit placement. Rated to 36,500 grain capacity, 10 micron sediment removal, and 10 ppm (parts per million) iron removal. Hardness determination test included. Installation CD included. 30.75" H. x 14.75" W. x 18.75" D.