Lakes play an essential role in the balance of ecosystems and the sustainability of life on Earth. They act as freshwater reservoirs, providing crucial habitat for a variety of aquatic and terrestrial species, yet these day by day face severe pollution, visible in algae blooms and foul odor, due to the untreated discharge of urban and industrial wastewater. This eutrophication is detrimental to health, the ecosystem and the local economy. The study focuses on evaluating the use of oxygen nanobubbles to improve water quality. Key parameters such as phosphorus and nitrogen, the main causes of eutrophication, were measured, along with pH, dissolved oxygen and turbidity, in order to recover the water quality of the lake under study.