What I am referring to is a method to "clean up" the water that gets polluted by our factory production. Something to process and clean up the water. This could provide more subterranean piping options as well as a whole new avenue of building options.
I know it's a bit pie in the sky, but I also ...

I would love to see some options for water treatment implemented into the core game. I know there are mods for this, but I am a purist and like to go modless myself (as I assume many others do). I think there are a lot of fun possibilities in this category.