Kidneys clean our blood. They throw away all the excess water,salts and bad chemicals that collect in the blood into the urine. We have two kidneys to do this work. The kidneys are located in the back on either side of the backbone at the waist level just below the rib. The kidneys look like Rajmah beans.Only they are much bigger.Each kidney is the size of the person’s fist. The kidneys have filters to do this work. The kidneys have one million filters called NEPHRONS to do all this work. As the blood flows through the kidneys they have to pass through these filters.These filters are very efficient security guards