5. Conclusion and outlook

In conclusion, water geochemistry modeling software has reached more than sufficient maturity, in terms of scientific concepts implemented, numerical robustness and user-friendliness, to be useful to researchers and engineers in the many fields illustrated in this document. The limiting factor is currently the availability of thermodynamic data, particularly in the field of sorption. In addition, two areas of development are in full swing: the coupling of hydrogeochemical models to microbiology on the one hand, and to hydrogeology on the other.