No, no issues. Again, the fluid is 99% DI water. So, if you have anything in your system that DI water is going to corrode then it is a possibility. ZnO2 does not react with copper or aluminum or nickle, so it isn't going to do anything that DI water wouldn't do. I spoke to our chemist about the issue as well, and that is pretty much exactly what he told me. I'll see if I can get a nickle plated fitting and soak it in a cup of the coolant and see what happens. I keep meaning to take apart the system at the house that has been running for almost three years without any upkeep. I will see how the cpu block looks. Also, when I get home I have two blocks that were running Ice Dragon back in January that have been sitting on the bench. I will see how those look.