Outcomes of comparative research of sorption properties and chemical stability of natural klinoptilolyth and ferro/cyanide sorbents on its base are presented. It was stated that surface modification of klinoptilolyth enabled 100-1000 times increase of the cesium-saturated samples’ chemical stability. It was shown that ferro/cyanide sorbents based on klinoptilolyth were promising materials for rehabilitation of natural water bodies and soils.