It is also capable of exchanging heavy metals, ammonia nitrogen, adsorbing iron and manganese and thus purifying drinking water or wastewater so that it properly reaches the receiving organs. Natural zeolites also play an important role in agriculture, for improving the arable land, for enhancing chemical and organic fertilizers or as a component of substrates for different crops. The adsorption and ion exchange properties of natural zeolites and their high content of plant nutrients determine their use in crop production, in particular as raw materials for the production of substrates. The addition of zeolites improves the properties of the soil: they capture ammonium and potassium, conserve moisture, prevent diseases in the roots of plants, and they serve as a source of microelements. In particular, adding clinoptilolite to the soil with fertilizers leads to the retention of nutrients and their better assimilation by the plants.