R3, You don't have a problem because YOU TOOK A INORDINATE AMOUNT OF TIME TO CLEAN IT OFF !!!

Here's my own experience : I bought the TC radiator directly from the TC factory in the UK (cheaper than ordering from the US) and when I got it, I did a normal cleanup, flushing about 3-4 gallons of water and shaking a bit. I setup the loop and let it run without problems. 3 weeks later, the tubing is getting brown/greenish even if I used distilled water + PT Nuke only so I disassembled it, tried to flush the radiator just to notice the water is still trouble ! I spend the whole evening flushing it with BOILING WATER from the kettle, shaked it a lot and let it sit for 30 mins each time. I did it until the water coming out of the radiator in the glass is still transparent. After this, it works fine and the reservoir remained clean (I replaced the tubing with Tygon R-3400 at the same time).

Now, I recently bought a HWLabs Black Ice GTX 240 for my HTPC box and I did 40 mins of cleaning just to notice the water is almost always clean each time I flushed. I setup a test loop with all the components and after 1 month of running, it's still clean. This is what I expect TC to do and they are too lazy, despite the high price.

Beside the cleaning issue, I love the TC radiator and I'll keep it until it leak (not for 10 years for sure). Your attempts to defend based on YOUR OWN EXPERIENCE only is not necessarily a good idea because the majority will agree with me and navanod about the TC cleaning issue. Those who say that it's a issue with chemical reaction, I'm a strong believer of distilled water only with PT Nuke (1 drop per liter).