Every minute, some 125 cubic centimeters (7.6 cubic inches) of fluid is filtered in the kidneys’ microfilters, and this fluid is passed by the bloodstream as waste products to the other side of the filters. This means that 180 liters (47.5 gallons) are filtered every day—enough to fill the gas tanks of four cars. 44 Of course, a human body weighing 60 to 70 kilograms (130 to 145 pounds) couldn’t possibly withstand the loss of 180 liters (47.5 gallons) of fluid every day.
Moreover, in addition to containing toxic substances, this fluid also contains vital ingredients such as amino acids, vitamins and glucose. The loss of these materials would result in death. That being so, the fluid must not be expelled from the body immediately. First, useful substances need to be identified, retained, and re-acquired for the body’s use.
In fact, 99% of the fluid passed through the micro filters is re-absorbed by the kidneys and released back into the bloodstream. At the same time, substances the body needs are caught one by one for re-use. Vitamins, amino acids and other important substances are thus prevented from being expelled in the urine.
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