ResinTech SIR-600 is a sodium/potassium form granular aluminosilicate zeolite. SIR-600 is an inorganic cation exchanger that can also capture certain ions by molecular sieving. SIR-600 is particularly selective for cesium, potassium, and ammonium. SIR-600 is intended for removal of radioactive cesium from waste waters that contain moderate levels of sodium and potassium, and for removal of ammonia from water. SIR-600 is supplied in the mixed sodium/potassium form.