The most relevant features of BIO_PORE are: 1) the inclusion of attachment and detachment processes for influent particulate components, which permits to simulate solids accumulation in the gravel media; 2) a complex hydraulic sub-model which calculates the exact location of the water table level at each time, preventing the growth of bacteria in dry areas of the wetland (above the water level); 3) a biofilm sub-model, which prevents unrealistic growth of biomass and takes into account the effect of inert solids accumulation on bacteria growth. For details on model equations, main hypothesis and assumptions, calibration and limitations, the reader is referred to Samsó and García