The best treatment for hard water
The typical ion exchange system (or water softener) consists of a pressurized mineral tank filled with water softener resin (sulfonated, polystyrene beads) that is capable of removing hardness ions, positive charged, from water and replacing them with softer ions, negative charged, such as sodium.
The mineral tank is connected to a brine tank that’s filled with salt, which periodically regenerates the resin beads. During the regeneration process, the salt solution in the brine tank flushes the calcium and magnesium off the resin in the softener and the resin is recharged with sodium, an exchange of positive and negative ions, before being sent to the drain. The brine solution from your brine tank is the fuel to recharge the resin with sodium providing you with softened water.