I use this ..... Petra's Tech Shop
And this.... Petra's Tech Shop
And one ounce of Glycerin, which you can get for a couple of bux from any pharmacy...Use 1 oz to every quart of distilled water....And the other stuff as directed on the label....EDIT:
You need to clean your rad out with 10% white vinegar and 90% distilled water to...Just fill it up and let it set over night, shake it a few times to...Then rinse with distilled water till you cant smell vinegar anymore...New rads you will usually get a lot of white crud out of it...It's good to do to a used one to kill off any bacteria....
I don't know of any non-conductive formulas...Check this thread out to......Info: What liquid should I use in my water cooling? - Overclock.net - Overclocking.net