PHREEQC and Reaktoro were also used to predict the bubble point pressure at the Margretheholm geothermal plant in Copenhagen. At this facility, highly saline brine (19% wt) at 72⁰C is produced to provide 14 MW heat for district heating purposes . When starting up the plant, it was found that the bubble point pressure was higher than it had been previously estimated from water/gas samples. The production wellhead pressure was therefore increased to 15 bar. The bubble point pressure was then estimated at around 20 bar ; yet no information on the fluid composition, besides the overall salinity, is provided. Thus, to determine the bubble point pressure with PHREEQC and Reaktoro, the composition at Margretheholm is taken from ref . A slightly different composition is reported in ref . The fluid composition considered in our calculations is included in Table . The evolution of the gas volume per unit volume of solution for the Margretheholm fluid is shown in Figure . The gas-liquid equilibration was calculated under different scenarios. The black line corresponds to the gas-liquid volume ratio at different pressures considering the fluid composition described in Table ; this leads to a degassing pressure of approximately 50 bar, considerably above the bubble point pressure estimated during the operation of the geothermal facility. The calculated bubble point pressure decreases considerably, i.e., to approximately 36 bar when considering that the GLR is not extrapolated at standard temperature but measured at the production temperature (blue line). Moreover, describing the fluid composition in terms of NaCl salinity only, further decreases the bubble point pressure up to approximately 28 bar. Taking into account the exact fluid composition plays a great effect on the predicted bubble point pressure. Moreover, all scenarios considered predict a much higher bubble point pressure than what was determined operationally as degassing pressure. Yet, at 20 bar, the pressure at which degassing was estimated to take place during operation, simulations show that the volume of gas is less than 2% compared to that of the solution. Generally, standard centrifugal pumps can be used for entrained gases up to 4% by volume. It is possible that operationally, even though degassing might have occurred at higher pressures, the amount of gas is not considerable enough to impair operation. Thus, the pressure that leads to relevant degassing during operation, it is not necessarily a "true" bubble point pressure, which could eventually be much higher.