摘要：For this study, Hardness with concentration of 50, 100, 150, 200 mg per liter in water were prepared. Each of these levels is made under the influence of a magnetic field with different intensity were both 5 and 10 minutes. For this purpose, magnetic fields with different intensity 4, 6, 8, 10, 20 mT in the space of 5 minutes and again with 10, 20, 50, 70 and 100 mT at 10 minutes. Results show indicated that when the time increased to 10 minutes to remove the hardness of the water
关键词：wastewater ; water hardness ; magnetic field strength
