Industrial development in the 20th century brought environmental pollution, which includes also the water. Industrial activity, especially metallurgical and engineering industry brings pollution by heavy metals. These substances act on living organisms toxic, therefore the individual components of the environment are strictly monitored. Current research of heavy metals removal is intended for the use of low-cost methods such as the sorption on natural materials, as zeolites, and also their use as ion-exchangers. The paper presents research results of sorption properties of natural zeolite - clinoptilolite considering sorption of copper cations.