Some perspective...

Your kidneys filter 180 L of fluid per day.... thats 45 gallons of fluid per day.
However, they manage to recover all but 1.5 L of fluid (urine) per day.... about 1/3 of a gallon.
That means they are filtering 65,700 L of fluid per year... about 16,425 gallons per year.
Yet, only 137 gallons per year come out as urine.
In a life time the average set of male kidneys will have processed 1.2 million gallons of fluid...
...and produced 10,265 gallons of urine!!!

Now that's hard work!

•