Hmmm...now I am getting a bit concerned here. I am using straight Fluid XP EXT blue in both my water loops. The strange thing is that my CPU loop is nice and clean and clear blue but the GPU loop looks like it has 2 different liquids in it. The res, when you shine a flashlight in it is all swirly and you can actually watch how the liquid flows thru the res., yet the CPU loop res looks totally still. I am beginning to wonder if this isn't the beginning stages of the whiteout!!....sigh