What do you use as water additive?

I am curious to see what the majority of people use in their water to prevent corrosion, and increase thermal "capacity".

Is Zerex Super Coolant still the additive of choice? How many of you use Antifreeze/Dexcool Anti-freeze? Does anyone still use Water Wetter knowing what it does to your stuff?

I use Prestone Dexcool Anti-Freeze - a lovely orange in color it seems to be working just as well as my water wetter did before I flushed it out (didn't want al my stuff to be coated with white gunk) - temperatures hanging around the same as before.

I'm thinking of using CAT coolant system conditioner when I get my rig WC'ed, as it doesn't require a trip to the store (just the parts counter)

I use about 10% Havoline Dexcool Antifreeze. Yeah, I really dig that orange color.