Downstream of the Duero River, at the end of the urban area of the city, by the Olivares neighborhood, is one of the oldest water mills in Zamora. In the second half of the 18th century, there was a fulling mill with five wheels, owned by the nuns of La Concepción, known as Los Pisones, where the wool was conditioned for the production of cloth, by means of a machine equipped with hammers to hit, degrease and squeeze. the cloths.