Difference between soft and hard water

Water hardness refers to the water content of calcium magnesium. Calcium magnesium levels, the higher the water hardness is taller (namely hard water), calcium magnesium levels is lower, the water hardness had lower (namely water softener).
Chemical encyclopedia of basic chemistry are introduced the water hardness of adjustment, can use Tastes soil, blackwater and chemicals to reduce water hardness, also can use special soft distilled water and tap water against the mixed to obtain different hardness of water. In addition, the active carbon or ion-exchange resin as filters, also can be in different degrees lower water hardness.