The urine formation process follows the following stages:
Blood vessels leading to the nephron form the glomerulus of Malpighi, a microscopic, ball-shaped capillary system surrounded by Bowman's capsule. The blood that reaches the nephrons is under great pressure, and water, glucose, vitamins, amino acids, sodium, potassium, chlorides, urea and other salts leave these capillaries, which pass into Bowman's capsule. 20% of the blood plasma that reaches the nephron is filtered, about 150 liters of primary urine per day. Logically, an organism that loses so much water would dehydrate very quickly, so it cannot afford it.