Nitrates in water occur due to fertilization of fields with nitrogen fertilizers and discharge of inadequately treated wastewater. Nitrate is the highest oxidation level of nitrogen. Groundwater contains relatively small amounts of these pollutants, but in recent years there has been a tendency for this compound to increase. Nitrates introduced into the human body can have a negative impact on human health, especially that of small children, because they can cause cyanosis. Nitrate removal methods are based on biochemical or physical-chemical processes. Currently, ion exchange or membrane filtration (reverse osmosis) are considered to be optimal solutions. The ion exchange cycle uses anion exchangers to retain first sulfate and then nitrate. Therefore, when designing technologies for nitrate removal and elimination, it is necessary to determine the amount of sulfate.