220 (in sodium form) is used to exchange sodium ions for hardness forming calcium and magnesium, and thus produce soft water. At the end of each service cycle, the ion exchange resin is regenerated with sodium chloride solution, after which the unit is ready for the next service cycle.
The NG series currently comprises a total of eight models with four flow rate. The different between these is in the total volume of cation exchange resins used.
|