Quote Originally Posted by bigsby
It's called an "ice box" and there are all kinds of attending systems that you need to put in place. Crazy expensive. Run a search on any decent hydro supply site for ice and you'll find it.
Actually, you don't need any sort of extra systems if you ran it open flow. All you need is a connect to water and a drain out, that's it. Sure if you wanted to run a closed system you'd need peltier coolers and all other kinds of fun stuff, but otherwise you can just hook water up to those and go, they are that simple.

They are designed to work with ground-pumped water or tap. Ground-pumped water is much better and keeps it much cooler. I'm lucky I can run direct out if I wanted to, though I don't need to since I don't use HID any longer. My community has a water treatment plant so running direct to waste is no issue since our water is constantly recycled. Nice tight system.