During the meeting, some results on purification of wastewater from geothermal fields were discussed. The critical properties of materials for sorption-membrane filtration system as well as for reversed electrodialysis stack were determined. The preliminary results were discussed. After the meeting its participants attended the XII conference Membrane and Membrane Processes in Environmental Protection hold in Zakopane. They presented there the following lectures Wastewater reclamation and desalination by membrane processes to produce water for agricultural irrigation and industrial reuse, The concept of multi-variant use of geothermal water concentrates, Hybrid Capacitive Deionization for selective capturing of lithium ions from aqueous solutions. The conference was attended by 80 people from universities of Canada, Belgium, Belorussia, Czechia, Poland and from industry.