## 3 Results and Discussion  
Ultrafiltration of medicinal waters was carried out. The productivity of the process was determined, its dependence on the filtration time, the type of medicinal water source, the titratable acidity, the content of sulfide and chloride ions, heavy metals, and electrical conductivity were determined in the filtrate and concentrate. The parameters were determined according to the type of healing water, the source area and the parameters of ultrafiltration process. Figure 5 shows the dependence of the productivity of the ultrafiltration process of the medicinal waters (Danisparavalli, Makhinjauri, Naminauri) on the filtration time. Figure 4: Technical scheme of ultrafiltration-dynamic mode: 1—pectin isolate volume, 2—pump, 3—mechanical filter, 4—membrane filter, 5—nanometer, 6—tap, 7—filtrate volume. Figure 5: The dependence of the productivity of the ultrafiltration process on time. Figure 3: The scheme of ultrafiltration process. It was found that the productivity of the process of ultrafiltration of the Danisparauli water decreased over time and remained unchanged during filtration of the Makhinjauri and Naminauri waters. In permeate (filtrate) and concentrate, obtained as a result of filtration, a chemical analysis of the water was carried out. The titratable acidity data are presented in Figure 6.  
It was found that during ultrafiltration, the titratable acidity (CH\({}^{+}\)) of the Makhinjauri water increased significantly, by 66.5% (0.051-0.152 mmol/H\({}^{+}\)), of the Naminauri water--by 36.6% (0.045-0.071), while the titratable acidity of the Danisparauli water remained unchanged. In sulfur-containing waters, the content of sulfide (S\({}^{2-}\)) ions was determined in the filtrate and concentrate (Figure 7). It was found that, in the process of concentrating, the content of sulfide (S\({}^{2-}\)) ions in the Naminauri water increases by 12%, and, in the Makhinjauri water, by 35.5%. It has been established that the process of concentrating the Makhinjauri mineral water is more efficient than the Naminauri water. This result makes it possible to obtain and use the concentrate of the Makhinjauri mineral water, which is especially important in the treatment of fungal diseases with this water. Chloride content was also determined in the filtrate and concentrate (Figure 8). Figure 6: Change in titratable acidity C(H\({}^{+}\)) of medicinal waters during ultrafiltration. Figure 7: Change in the content of sulfide ions during ultrafiltration of Naminauri and Makhinjauri mineral waters. It was found that the chloride content in the process of concentration is practically unchanged--that is, during the ultrafiltration process, chlorides are not retained by the filter hollow fibers and they completely pass into the concentrate. Hence it follows that the mineral composition of water in terms of chloride content does not change during ultrafiltration, which is very important, since it is the mineral composition that determines, overall, the healing effect of many waters. To assess ecological cleanliness, the content of elements, mainly metals, was determined in medicinal waters (in total, 23 elements were determined): Cr, Fe, B, K, Ca, Mg, Na, Ba, Ti, Cd, Mo, Mn, Ni, Co, As, Sb, Pb, Si, Hg, V, Cu, Al, Zn (Figures 9-16). Figure 11: The content of Na, Ba and Ti in the mineral waters. Figure 12: The content of Cd, Mo and Mn in the mineral waters. Figure 13: The content of Co, Ni and As in the mineral waters. It is known that heavy metals have a negative effect on the human body, accumulate in it and ultimately cause blood disease--leukemia. On the one hand, a person taking mineral water facilitates the course of a specific disease, but on the other hand, he can get a blood disease  
The data of the analysis of mineral waters for the content of metals, including heavy ones, are shown on Figures 9-16.