Inclusion of sodium chloride in the large and small cavities of zeolite NaY was performed with the aid of the solid-state dispersion technique. Samples with different amounts of NaCl were subjected to various pretreatment conditions, including intensive washing with water, and were investigated with the methods of X-ray diffraction and nitrogen and xenon adsorption as well as with Xe-129 and Na-23 nuclear magnetic resonance spectroscopy. The results obtained permit determination of the extent of salt inclusion in both types of cavities, the stability of the salt clusters toward treatment with water, and the characterization of these clusters by their Na-23 NMR behavior under static and magic angle spinning conditions.