The Culligan Aquasential Select Plus Series 9”, 10”, 10” S, 12”, CleanWater Home™ 9” and 10” Water Softeners have been tested and certified by WQA against NSF/ANSI 372, CSA B483 1, and NSF/ANSI Standard 44 for the effective reduction of calcium and magnesium (hardness) along with barium and radium 226/228