It's about time! It always irked me that they only had aluminum and essentially promoted mixed metal loops.

mstcobra:

It's about time! It always irked me that they only had aluminum and essentially promoted mixed metal loops.

Thermaltake moved to copper a couple years back, actually. You are actually far more likely to have your loop fouled by a fancy coolant than galvanic corrosion, and every loop is still mixed metal anyway. Aluminum may be the most infamous offender, but almost every radiator mixes a copper loop with a brass tank, and most parts are nickel plated, all of which will react with one another. Even mixing parts from different manufacturers can cause reactions, because the grades of copper and nickel used can vary greatly, and the impurities can accelerate galvanic reactions (things to keep in mind when you are thinking about throwing those cheap Barrow or XSPC parts into your EK or Bitspower loop). Sticking with distilled water plus a biocide and anti-corrosive will cut your maintenance down to once every year to year and a half, and allow you to see when your loop starts to cloud. It's also worth noting that every single AIO cooler out there has a copper block and aluminum rad, and they can go years with no issues - their closed systems and lack of light exposure helps a lot with bio and corrosion issues.