Water Density Won't Equalize to All Surface

Nothing wrong.

There's polluted water on each side of this big amout of water. The two don't mix up, so he polluted water stop clear water from flowing.

@Gwido can you try my save file from there and use sandbox mode to remove those polluted waters?  My pc suddenly broke it wont boot. 

Honestly, if you're at that point of your game ... just start a new one.

 

And you can get rid of all this flooding, without unsing the sandbox mode.

Edited November 22, 2018 by Gwido