**Clay silts** are deposits of clay layers in water basins, which are formed as a result of the accumulation of clay particles during the dissolution of these rocks under the influence of waves and currents. The waters of rivers, lakes and other reservoirs contain a large number of suspended particles of different sizes, among which clayey particles predominate. The transfer of mud by clays occurs very slowly. This ability has long been used by humans for medicinal purposes. Clay is used in the form of mud with the addition of some medicinal substances - special applications. To obtain medicinal mud ointment, both the volcanic eruption itself and the medicinal mud formed after it are used. The word "dirt" comes from the Old Russian