TRN, you are running tab water in your loop right? As others have suggested, I would strongly recommend adding a real corrosion inhibitor to the mix (not PT nuke)
I use 1 part BASF G48 to 10 parts of destilled water in my watercooling loops. Works great even in mixed copper/alu loops (I have those for purely passive WC setups). No corrosion whatsoever even after several years of runtime.
Besides, it looks cool - turns your water into a light blue. You should be able to buy it at your local car dealer (since it's the same stuff that goes into cars) or order it online.
It also offers algae protection and anti-freeze capabilities - the perfect AIO solution really. For cars and PCs alike
http://www.basf.com/group/corporate/en/brand/GLYSANTIN
What you want is the topmost bottle here:
http://www.veredlungschemikalien.bas...antin/products
The others work just as well, but being red, they turn your water into a really gay looking color
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