Buying a refurbished cpu water cooler

[Goobley]

They use distilled with propylene glycol. Even if the water was de-ionised when the loop was filled, I'm fairly sure that it wouldn't remain that way when in contact with a copper CPU block and copper or alu rad. Failures in these coolers are seriously rare anyway and there's obviously a lot of confidence in them now considering the number of system integrators that use them (I doubt they would if it led to a lot more warranty work).

[fma965]

Yeah your point makes sense, i use a cooler master seidon in my mini-itx cooler master elite 130 case