Reactive transport modelling has established itself as a key player to analyze sophisticated hydrogeochemical interactions that occur over spatio-temporal scales on par with subsurface applications. In this paper, we benchmarked a new reactive transport package-porousMedia4Foam at the continuum-scale considering complex and well established cases available in the reactive transport modelling community. porousMedia4Foam was born by the successful coupling of two open-source packages-OpenFOAM ® and PHREEQC. The flow governing equations, transport of species and the evolution of porous media properties are handled by OpenFOAM ® whereas, the geochemistry is exclusively handled by PHREEQC. We further demonstrated the capability of using porousMedia4Foam to investigate reactive transport processes considering unstructured meshes. As porousMedia4Foam is an open-source package with included benefits to account for reactive transport processes occurring at various scales-pore-, hybrid-, and, Darcy-scales, we believe that porousMedia4Foam opens a new dimension to analyze reactive transport physics for various intriguing subsurface applications.