Hmm. Ok now I have a question about all this. I understand that deionized water is stripped of its ions through the deionizer and all. Here in the lab that I work at, we usually keep all deionized water in plastic carboys and it never comes into contact with metal. Now if it's going into your cooling loop, isn't the water going to pick up trace amounts of cations anyways going through the rad and the metal waterblocks that cool the cpu/gpu?