The March/April issue of “Hydro” is online. The special coverage “Sanitation Directory: Advances and prospects 3 years after the publication of the New Brazilian Sanitation Framework”, on page 20, shows how the sanitation sector has been since the approval of the Legal Framework in July 2020. With resources and the progress of works in municipalities, Brazil's GDP could be 2.7% higher. See on page 34, the article “Reduction of water consumption in cooling towers”, bringing the main results of the research in a large thermoelectric power plant that was selected for a study with BAC - bromide-activated chloramine as a substitute for sodium hypochlorite in water treatment cooling tower replacement. Furthermore, on page 42, the article “Mixing ETA waste with sanitary sewage to remove phosphorus”, a study that simulated the processes of coagulation, flocculation and sedimentation in Jar Test mixing raw, thickened and dry RETA with sanitary sewage to evaluate changes in phosphorus removal, pH and turbidity. This issue also brings the update “Pumps”, “Filtration systems” and “Tanks waterproofing products” buyers’ guides.