I'm asking because I took apart my system to install my new 280GTX.
I only had Feser UV Blue for a little more than 2 weeks in the loop, and I noticed that my Primochill 7/16" Pro LRT was clouded and looked pinkish.
I was kinda surprised to see this happen after only 2 weeks.
I tried cleaning one piece of tubing but Cilit Bang (I always use it to clean tubing), but it didn't help.