Ion exchanger arrangement (10) with an upstream inlet (18) and a downstream outlet (20) for treating water by means of ion exchanger granules, comprising (a) a module container (14) arranged in the flow path; and (b) at least one granulate module (50) with ion exchange granules which can be replaced in the flow path in the module container (14), the granulate module having a water-permeable, granulate-retaining structure (60, 70) on the upstream and downstream sides.
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