The BIO_PORE model is a mathematical code built in the COMSOL Multiphysics™ platform that was specifically designed to simulate the behaviour of SSF CWs and incorporates the biokinetic reactions described in the Constructed Wetland Model Number 1 (CWM1) (Samsó and García, 2013). CWM1 was published with the aim of providing a widely accepted formulation for the main bacterial transformation and degradation processes of organic matter, nitrogen and sulphur in SSF CWs