HD uses a dialyser (filter) and a HD machine to clean and filter your blood.

During the treatment, a portion of your blood is pumped through a specially prepared sterile tubing set to the dialyser, where excess body water and waste products are removed. The clean blood is then returned to your body through the tubing. Only about one cup of blood is outside your body at any one time during the treatment.

The average adult has between 4–5 litres of blood in his or her body, and can easily tolerate this small amount out of the body.

The HD machine is well equipped to constantly check and make sure your treatment is going well. Changes in the system cause a bell, buzzer or other type of signal to sound so that any adjustments needed can be made.