 It's a very noisy process. Someone's just shown me a pair of headphones that they wear. Before long, the water from the sewage works began moving along different pipes. First, the wastewater was separated into two tanks. One containing sodium chloride, that's table salt, and the other had different minerals. You have two streams. So the yellow and brown one is calcium magnesium and the blue one is the sodium chloride. This is the one.