These type of plants are used to Soften water for Boiler feeding, Cooling tower feeding, Chillers feeding etc, to safe them from scale. Softeners are of three kinds,
1- Catine based Softener
2- Annine Based Softener
3- Mix Bed
Softeners are normally used to pure water from hardness made by Calcium and Magnesium. It is a resin based technology which reduces hardness by exchanging ions of hardness like Calcium and Magnesium by Sodium. That resin could be positively charged or may be negatively charged and some often both resins are used in a softening plant. According to hardness properties in water.
1- Pre- Filtration by Sand
2- Pre- Filtration by Carbon
3- Resin bed
4- Filtration by Cartage Filters