Dialysis blocks the passage of larger substances (for example, red blood cells, large proteins). This replicates the filtering process that takes place in the kidneys when the blood enters the kidneys and the larger substances are separated from the smaller ones in the glomerulus. The two main types of dialysis, hemodialysis and peritoneal dialysis, remove wastes and excess water from the blood in different ways. Hemodialysis removes wastes and water by circulating blood outside the body through an external filter, called a dialyzer, that contains a semipermeable membrane. The blood flows in one direction and the dialysate flows in the opposite.
O Blood and Water O Blood and Water O Blood and Water (Polish: "O krwi i wodo"), also known as conversion prayer, is a prayer to the Divine Mercy revealed by Jesus to saint Faustina Kowalska. Its full text, as reported in the "Diary", is: "O blood and water, which gushed forth from the heart of Jesus as a fountain of mercy for us, I/we trust in you". In the Polish original it is: "O krwi i wodo, któraś wytrysnęła z serca Jezusowego jako zdrój miłosierdzia dla nas, ufam/-y tobie". It may be regarded as an extension of the jaculatory prayer "Jezu, ufam tobie"