As a result of anthropogenic human activity and the continuous increase in the scale of water consumption, surface and groundwater, which are sources of freshwater, have been degraded. Most water sources have high iron content today. Contamination of groundwater with iron and other metals can occur due to the development of ore deposits and the operation of quarries. Existing technologies only partially solve this problem. Ions of heavy metals are toxic and dangerous for living organisms and for human beings. In this regard, it is important to develop effective methods of water treatment of various pollutants. Today, pollution of water bodies with iron ions has reached a critical level. This creates a problem for many regions not only in Ukraine, but also far beyond its borders. The problem is urgent and needs to be solved. When the pH value in water is less than 6.8–7.0 and the concentration of iron is high, for deep purification, it is advisable to use a combination of a number of methods with the introduction of reagents. Reagent method of deironing is implemented by treating the source water with a suspension of lime water Ca(OH)2. This approach allows one to deirone water effectively, but its implementation is accompanied by the formation of a large amount of sludge, which must be disposed of. An effective way to dispose of such precipitates is their use as a chemical additive in the production of cement, which was confirmed by our research.