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Productivity of geothermal reservoirs is often limited by capability of injection wells due to clogging of near-filter zone or increased viscosity of cooled waters. Especially for highly saline reservoirs, injection of cooled waters to water-bearing formation is often the only way of their disposal. In turn, this phenomena has little importance in case of low-mineralized waters. However, several water-treatment procedures can be used to recover valuable minerals, thus producing diluted water and salt concentrate. ...