The engineering company AGquadro has its “main topic” in the design of wastewater treatment plants, both civil and industrial. The previous experience of its specialized technicians has also allowed us to go into the design of equipment used in the field of water treatment. Therefore, concrete ideas were born that led to the construction of machines starting from the initial research phase, up to the supply, passing from the various design phases to the realization of prototypes which were then industrialized. Real examples are represented by the EBF Reactor, a reactor for the proliferation of indigenous bacterial strains, and the Poly Feeder, built for the preparation of the water-polyelectrolyte mixture necessary for the dehydration of the sewage sludge. With this in mind, in collaboration with the company NCR Biochemical SpA of Castello d’Argile (Bologna), the creation of a prototype of a pilot plant for the fermentation of selected bacterial strains always used in the treatment of waste water called «EBF PLUS>.