Resorcinol-formaldehyde resins for the removal of Cs from liquid media have been synthesized by polymerization of the emulsion dispersion phase. Chemical stability and kinetic parameters of the ion-exchange process in the porous ion exchangers have been estimated using the diffusion coefficient and the exchange half-time. The results of Cs (Cs-133 i Cs-137) removal under static and dynamic conditions are provided. The efficiency of Cs removal from the simulated solution of the evaporator concentrate (EC) containing Cu2+, Co2+, Cr3+, and Ni2+ cations has been estimated. Good prospects of application of porous ion exchangers in the function of materials for Cs removal from highly mineralized alkali media have been demonstrated.