 The emergence of the mush paradigm has raised several questions about the mechanisms behind the formation of liquid-rich domains in magmas. Reactive flow has recently been suggested as a potential mechanism for driving the formation of these domains, but its effects have not yet been accurately simulated. This study used a thermodynamically constrained model of melt mush reaction to investigate the impact of reactive flow on the porosity of natural mush systems. Results showed that reactive flow would in charto-like to gobroic mushes can cause significant changes in mush porosity, such as increasing the system porosity and potentially leading to mush destabilization and rapid melt transfer. These findings suggest that reactive flow may play a key role in controlling the formation and evolution of mush-rich systems. This article was authored by Matthew L. M. Gleeson, C. Johan Lissenberg and Paula M. Antoshechkina.