At this case, joining of hardness minerals end. To be able to remain at water hardness ions, resin particles must be rid of from hardness minerals, again sodium particles must be tied. This process is called Regeneration. Regeneration process consist of 5 main steps that are back-wash, salt water absorption, slow rinsing, fast rinsing and salty water filling. As a result of conclusion of 5 steps, while resin, calcium (Ca2 + ) and Magnesium (Mg2 + ) leaves their ions, sodium (Na+) again combines ions to itself and be ready to service position. When design of AQUALINE Water Softening Units is made, resin quantity which will be placed inside resin tank is calculated according to raw water characteristic, average daily flow and peak flow consumption. Beside this, regeneration process can be made time control, flow control or with hardness analyzer and in connection with measuring of hardness degree of pure water, regeneration process can be made with automation.