Ion exchange resinsconsists of two main types, i.e.,cation exchange resins, that exchange positively charged ions, such assodium, for calcium, andanion exchange resins, that exchange negatively charged ions, such as chloride, for . Resins are usually made from thepolystyrene polymerbackbone and differ only by their specific functional groups. The ion exchange systems are usually regenerated with sodium chloride. The strength of the solution depends on the strength of the adsorption bond. Usually, 0.1 NNaClis effective in removing even strongly adsorbed anions.Ion exchange resinsconsists of two main types, i.e.,cation exchange resins, that exchange positively charged ions, such assodium, for calcium, andanion exchange resins, that exchange negatively charged ions, such as chloride, for . Resins are usually made from thepolystyrene polymerbackbone and differ only by their specific functional groups. The ion exchange systems are usually regenerated with sodium chloride. The strength of the solution depends on the strength of the adsorption bond. Usually, 0.1 NNaClis effective in removing even strongly adsorbed anions.Ion exchange resinsconsists of two main types, i.e.,cation exchange resins, that exchange positively charged ions, such assodium, for calcium, andanion exchange resins, that exchange negatively charged ions, such as chloride, for . Resins are usually made from thepolystyrene polymerbackbone and differ only by their specific functional groups. The ion exchange systems are usually regenerated with sodium chloride. The strength of the solution depends on the strength of the adsorption bond. Usually, 0.1 NNaClis effective in removing even strongly adsorbed anions.