And at the same time, it utilizes as little energy as possible. So the only time we actually use any energy within our Loop of Henley is within the thick ascending loop of Henley. And we'll see why energy is used in this segment in just a moment. 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.