Water Softening is a process where Calcium and Magnesium ions are exchanged from Sodium ions. Calcium and Magnesium ions associated with alkalinity contribute for scale formation. These ions are also called as Total Hardness. The strong acid Cation Exchange Resin in Sodium form is used for softening the water. When the resin is exhausted, it is regenerated with brine solution (Sodium Chloride). 12% to 15% brine solution is normally used for the regeneration.