Water Softener is called as ion exchange water softeners. Its principle is using sodium cation exchange resin to remove calcium and magnesium ions in water and reduce raw water hardness in order to soften hard water and avoid carbonates fouling in the pipeline, container and boiler and so on.
Water softeners operate on a simple principle: Calcium and magnesium ions in the water switch places with more desirable ions, usually sodium. The exchange eliminates both of the problems of hard water because sodium doesn't precipitate out in pipes or react badly with soap. The amount of sodium this process adds to your water is quite small -- less than 12.5 milligrams per 8-ounce (237-milliliter) glass, well below the standard set by the food and drug administration for "very low sodium".
Input & Output water quality:
Input water hardness: ≤ 8mmol/L (8000ppm)
Products water hardness: ≤ 0.03mmol/L (30ppm)