I'm putting together a couple of new loops using the full copper Alphacool Nexxos radiators and I've read in a few forums that Alphacool radiators need alot of cleaning prior to use. Most of these posts are 3-4 years old however, and I'm wondering if Alphacool has improved on their cleaning process of their new lines of Radiators. In the past I've used XSPC Rads and have only rinsed them with warm distilled water prior to use, and haven't had any issues. It's also worth noting these rads look pretty clean, and after a cold water rinse, I've seen no debris.

I also have a couple of bottles of Primochill SysPrep, which is recommended to run a couple of days and is supposed to "clean" out your entire loop. In fact they say you can leave it in indefinitely, but recommend draining after running for 48 hours and replacing with coolant of choice.

Anyone have any experience with these new rads or with the Sysprep? Any thoughts would be welcome.