In the laboratory experiment on the columns, the scale of fluorine migration was established during repeated washing of serous-earth-oasis soil. It was shown that the soil in its natural state is characterized by the presence of a certain amount of water-soluble fluorine. The total losses for 8 washings with a total volume of leaked moisture of 1 l from non-fluorinated soil amounted to 1.2 mg F. When the soil was artificially contaminated with sodium fluoride, the number of migrating F increased many times (51.8 mg). The addition of limestone flour (LF) and phosphogypsum (FG) to the polluted soil resulted in a decrease in the mobility of fluorine, but its complete deposition was not observed. In most filtrates, the fluorine concentration exceeded the maximum permissible concentration (MPC) set for drinking water. It was revealed that the method of placement of meliorants had a significant impact on the migration losses of fluorine from the soil. When mixing LF and FG in the entire volume of the soil, the aver