The project involved upgrading the Fortore water treatment plant, located in the countryside near Castelnuovo della Daunia (FG), through the installation of a flotation system for the clarification of surface water and the removal of algae. The plant, which until then had relied solely on a powdered activated carbon dosing station installed in 2010, was unable to cope with periodic algal blooms, as its algal removal efficiency did not exceed 50%. With the new system, located upstream of the existing clarification section, the removal efficiency has increased to 90–99%. The new station was built on a plot of land outside the plant—specifically acquired for this purpose—and integrated in series with the existing system, with the option to bypass it or partially restrict the incoming flow. It consists of four dissolved-air flocculation and flotation units, capable of treating the entire maximum flow rate of 2,400 l/s (8,640 m³/h), fed by a branch from the main DN 1900 supply pipeline, from which the treated water is then returned to the cycle. The sludge and flotate are extracted and subjected to ozonation to sanitize them and prevent algal toxins from contaminating the sludge line and drains of the existing water treatment plant. The project was completed with a new station dedicated to the dosing of reagents, including aluminum polychloride, carbon dioxide, and hydrochloric acid, the replacement of the two vent valves on the supply pipeline, and a new MV/LV electrical substation with redundant transformers and inverters on the most energy-intensive equipment. Control is carried out from the control room of the existing plant, while the connection to the existing system required a plant shutdown of approximately 24 hours, scheduled to minimize service disruptions.