The physical properties, the phase diagram for the Na2O–Al2O3–H2O system, and the crystal structure of sodium aluminate were studied. In laboratory-scale experimentally simulation tests, the undesired sodium aluminate solution precipitation served as a sensor for the excursion during the makeup process and/or in the storage state. For example, the feedstock for the subsequent hydrous alumina oxide deposition on pigmentary titanium oxide could be avoided and even restored. On the basis of the guide from the “modified” phase diagram, the abnormal composition of sodium aluminate was mapped and regressed to the baseline of Na2O/Al2O3 with the mole ratio at 1.45, followed by the adjustment of water content through either water evaporation or water addition. The final required composition was recovered.