The main role of hemodialysis is to filter and purify the blood when the kidneys cannot perform the vital function adequately. Kidneys maintain the body’s internal balance and filter out waste products, excess fluids, and electrolytes from the bloodstream. When kidneys fail, these harmful substances accumulate in the body, leading to serious health complications. Hemodialysis acts as an artificial kidney, mimicking the natural filtration process to remove toxins and restore the chemical balance within the blood.