Mullite effect on the ceramic filters effectiveness in the removal of arsenic from borehole water from Burkina Faso oleh Kassoum Barry, Gisèle Laure Lecomte‐Nana, Nassio Sory, Moussa Ouedraogo, Loukou Sawadogo, Moustapha Sawadogo, Issaka Sanou, Mohamed Seynou, Lamine Zerbo, Philippe Blanchart