Ion exchanger device (10) containing an upstream inlet (18) and downstream outlet (20) for the treatment of water by ion exchanger grenade, containing:(a) a module container arranged in the flow path (14); and(b) at least one granular module interchangeable in the flow path in the module container (14) with ion exchange grenade (50), the granular module at the upstream and downstream sides having a water-permeable granulate-resistant structure (60, 70).
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