Aluminum ammonium sulfate dodecahydrate (ammonium alum hydrate) slurries are promising latent heat media for high temperature applications. However, a major problem associated with materials developed specifically for high temperature use is sedimentation in the pipes of the device. Thus, the ability of poly vinyl alcohol (PVA) to prevent sedimentation and particle growth of ammonium alum hydrates has been investigated in this study. In order to increase the fluidity of the slurry, a cationic surfactant, behenyl trimethyl ammonium chloride, was used as a drag-reducing agent, and the interaction between the cationic surfactant and PVA was evaluated. The rheological properties of the slurries and solutions were investigated, and they indicated that the drag-reducing cationic surfactant was not disturbed by the PVA.