Haemodialysis is a medical procedure that involves removing waste products and excess fluids from the blood when the kidneys are no longer functioning properly. It is used to treat patients with end-stage renal disease or acute kidney failure. During haemodialysis, the patient's blood is circulated through a dialysis machine that filters out waste products and then returns the clean blood back into the body. This process helps to maintain the body's fluid and electrolyte balance, as well as prevent complications from the build-up of toxins in the blood. Haemodialysis is typically performed several times a week and is a life-saving treatment for individuals with kidney failure.