The Disinfection and Disinfection By-Products conference is the international event promoted by IWA Disinfection Specialist Group related to disinfection, disinfection by-products and related topics. The conference stands as a relevant and well-recognized network opportunity for sharing the expertise of water professionals worldwide in the view of promoting innovative shared visions with respect to conference topics and shaping the future of water management. After three successful past editions, in Mexico, China and Italy, the 4th edition of the conference will take place in October 2024 in Spain and will be hosted by the Solar Energy Research Center, CIESOL, joint center between the University of Almeria and the Plataforma Solar de Almeria-CIEMAT. The conference will bring together academia, industry, water utilities, policy makers and other stakeholders of the water sector.