In this study, zeolitic volcanic tuffs (ZVT) originated from Transylvania, Romania were used, to remove ammonium ions from model solution. The zeolitic volcanic tuff samples used as ionic exchangers were characterized by means of chemical analysis, optical microscopy, SEM, XRD, FTIR, and BET analysis. The main zeolite species identified in the volcanic tuffs from mentioned areas is clinoptilolite. All samples were subjected to chemical treatment with HCl and NaCl, followed by the ionic exchange process. The ionic exchange process was realized in batch and fixed bed column conditions. We found that ionic exchange efficiency varies according to their zeolite content, therefore P (Paglisa) and M (Macicas) samples, which have the highest clinoptilolite content, proved to be more efficient.