an extracorporeal blood processing method using a blood circuit comprising a pair of blood passages attached to opposite flow ends of a blood treatment device and said blood circuit is mounted on a blood pump console , the method includes : withdrawing blood from a vascular system of a human patient and drawing the blood into the blood circuit ; pumping the withdrawn blood through one of the pair of blood passages using a first blood pump of the console and into the blood treatment device ; pumping the treated blood from the treatment device through the other of the pair of blood passages using a second blood pump of the console ; infusing the treated blood from the other blood passage and into the vascular system of the patient , and periodically reversing a flow direction of blood through the pair of blood passages and blood treatment device .