In recent years, scientists and engineers have focused on ways to exploit the possibility of treating greywater with natural techniques in urban contexts, with solutions that use normally unused surfaces, such as walls and roofs, thus saving space on the ground. Nonetheless, only a few examples exist outside the inner circle of university lab-scale attempts, namely, the VertECO, an indoor green wall system purifying stormwater and greywater developed in the EU funded project demEAUmed, or the Total Value Wall a building envelope designed and tested for the treatment of greywater in Continental climate conditions by a consortium of academic, NGO and private partners (some data available at https://doi.org/10.1016/j.jenvman.2021.113489). The Ferla Wall2Water contributes to this exciting new frontier of green infrastructure, offering multiple ecosystem services and aesthetic functions in urban areas by integrating a nature-based solution into a public building in a Mediterranean climate location.