Renal failure is an important complication of sepsis and CRRT with adsorbing membranes may be useful in this clinical setting [1]. The aims of the study in septic/septic shock patients are to evaluate: the safety of a new hemofilter membrane oXiris with adsorbing properties and anti-endotoxin activity; the renal and hemodynamic response; and the changes of endotoxin and proinflammatory molecules.