DIY chiller idea

[hillegom]

I do not know much about the inards of a water cooler. But we know it holds fresh water.
So the question to me is what metals if any are in contact with the water. Would not want the whole system to corrode or metal ions to go into the saltwater tank.
I know that some coolers are cooled electronically, ie, not with a system like your fridge.
Well that probablly raised more questions than it answered. Sorry