A water softener removes minerals like calcium and magnesium from the water supply. These minerals cause “hard water,” resulting in various issues. Water softeners replace calcium and magnesium with sodium or potassium, effectively softening the water and removing scale buildup on fixtures, reducing soap scum in showers and sinks, preventing the formation of limescale in appliances, and improving the efficiency and lifespan of water heaters, dishwashers, and washing machines.