Coolant is a liquid. We have learned by keeping it simple and not paying attention to hype marketing and years old links that distilled water (1$ a gallon at Walgreens) and a bit of silver that lasts forever or a teeny bottle of Petras PHN nuke (that also lasts forever, you need 4 drops per liter) is all you need.
In modern WC loops it's copper, brass, stainless steel etc. These metals do not react with each other. If aluminum rads (made by crap companies) are used, then yes you need quality anti-corossive stuff. The best is Volkswagon or Toyota dealership antifreeze in a 25% solution of distilled water. Its pretty blue or red too.
You need more info? Or does this set you right?