So what exactly is the meaning of the countercurrent multiply system. Well, the countercurrent simply means that along the descending loop of Henley, the filter travels downward, but along our ascending loop of Henley, the filter travels upward. So we have a counter current. The two currents move in opposite direction. Now, multiplier means the loop of Henley multiplies the amount of water. It increases the amount of water that is passively absorbed back into our body from the loop of Henley, as well as from other parts of our nephron, such as the collecting duct.