The January/February issue of “Hydro” is online. The special coverage “Digitization of sanitation companies, on page 16, shows how technologies such as IoT – Internet of Things and cloud computing are fostering the development of digital platforms aimed at real-time data analysis and management in sanitation sector, as well as their applications in reducing investment costs and operation in water and sewage companies. See on page 34 the article “Reuse in cooling towers”, presenting reuse as an alternative for cooling towers, as well as the necessary care for an effective application in order to avoid problems such as deposition, incrustation and corrosion. Furthermore, on page 40, the article “Valves in the water treatment process”, showing that to specify valve types to be adopted in water treatment process in an industry or sanitation company, it is important to observe the conditions it can handle and the applications for which they are intended. This issue brings also the update “Chemical and biological products for water and wastewater treatment” and “Valves” buyers’ guides, and “Engineering, contracting & service companies” directory.