Graciela Calvi, Agronomist Engineer, Corrientes, Argentina. April 2008. I have read the article about arsenic in water and find it really so good; I whish to congratulate the researchers and the task force. I am studying a Mastership in Environmental Management at UNL (Santa Fe) and I have this idea that you are really the only ones who could help me on HACRE, by providing me material or bibliographic index, web pages, etc. about water purification processes. I also need the map of the arsenic in our country, the provinces involved, and the increasing degree of this problem through the years, to demonstrate and inform about it to my teachers, who – with other professional profiles- know little about the issue. I would like to formally get in touch with you, and, of course, ask you to subscribe me to yours publications. I’m very grateful and very happy to have found you in the WEB