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Automatic softeners, are used to remove hardness in water treatment. They are used for domestic sewage, treated wastewater or industrial wastewater.

Then explain the basic principles of this system:
Some insoluble compounds have the ability to set alkali ions (these are: Ca, Mg, etc.), changing by sodium ions. Previously they were called zeolicos. When you run water through a bed of cation exchangers such sodium, alkaline earth salts found in the water become sodium salts.