Hemodialysis is a treatment to filter wastes and water from your blood, as your kidneys did when they were healthy. Hemodialysis helps control blood pressure and balance important minerals, such as potassium, sodium, and calcium, in your blood.
Hemodialysis does some of the work that your kidneys did when they were healthy. During treatment, your blood travels through tubes from your body into the dialysis machine. While your blood is in the machine, it goes through a filter called a dialyzer, which removes waste and extra fluid. Once it has been cleaned, the blood travels through tubes from the dialysis machine back into your body.