Cleans water, to make it suitable to drink. Part of the cleaning process heats up the water to an extremely high temperature to kill bacteria. I have no Idea if that is how real water refineries, and sewage treatment plants work, but I needed a reason to use all of those 1x2 grid tiles. Sorry that there are so few pics'.
Me again! I like the fact that you build what you like (like the powerstation) however you like it. This is again just cool, nothing else but purely cool. The water tank thingy is a really nice effect!