Medieval building used as a storehouse and weighing facility for salt, one of the main products traded through the port of Betanzos. The name “alfolí” comes from Arabic and translates as “salt well”. The salt trade was regulated by the Crown and was so important in Betanzos that the town even entered into legal disputes with the city of A Coruña over the monopoly of this commerce. It should also be noted that the Ría de Betanzos had its own salt pans in the Pedrido area.