Chronic kidney disease and acute renal failure cause the kidneys to lose their ability to filter and remove waste and extra fluid from the body. If your kidneys fail, you will need a life-saving treatment called dialysis to take over their job. Hemodialysis is a process that uses a man-made membrane (dialyzer) to remove wastes from the blood, restore the proper balance of electrolytes in the blood and eliminate extra fluid from the body.
For hemodialysis, you are connected to a filter (dialyzer) by tubes attached to your blood vessels. Your blood is slowly pumped from your body into the dialyzer, where waste products and extra fluid are removed. The filtered blood is then pumped back into your body.