PHREEQC and Reaktoro were also validated against the experimental data gathered within the "REFLECT" project. The main objective of this European project was to prevent problems related to fluid chemistry. To improve the extent and performance of predictive modelling, the project focused on collecting and obtaining new and high-quality experimental data. Production and injection data was collected in a European geothermal fluid atlas. As part of this initiative, the geological, physical, and chemical information of samples from geothermal wells in different countries was gathered in a European geothermal fluid atlas. Despite the vast data included in the atlas, information on the bubble point pressure is available only for a very limited number of wells. Moreover, in some cases, the bubble point pressure is not accompanied by the additional information required for its theoretical prediction (e.g., the composition of the gas phase or the GLR is missing). Within the atlas, the complete information for bubble point pressure calculation and comparison is available only for 5 wells (i.e., three from France and two from the Netherlands). The fluid chemistry data for these wells is gathered in Table .