Dialysis works to remove toxins and excess fluid through the process of diffusion and osmosis.
First the toxin removal When you are hooked up to a dialysis machine, your dialyzer works as a filter. Your blood is circulated on the inside of these membranes, while dialysate is circulated on the outside of these membranes, all within the dialyzer. Dialysate is a liquid medium made from filtered water and components that are similarly found within your blood. These components are your electrolytes such as potassium, and sodium. Here is where the word diffusion comes into play.