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Dialysis technicians, also called nephrology technicians or renal dialysis technicians, set up and operate hemodialysis artificial kidney machines for patients with chronic renal failure (CRF). CRF is a condition where the kidneys cease to function normally. Many people, especially diabetics or people who suffer from undetected high blood pressure, develop this condition. These patients require hemodialysis to sustain their lives. In hemodialysis the patient's blood is circulated through the dialysis machine, which filters out impurities, wastes, and excess fluids from the blood. The cleaned blood is then returned to the body. Dialysis technicians also maintain and repair this equipment as well as help educate the patient and family about dialysis.