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Zaz said:Is a corrosion inhibitor needed if using distilled water and using only copper components?
It is advised.
It really depends.
As an on-going corrosion experiment I run my all-copper White Water water-block with brass barbs with a copper heater-core and Eheim pump without any form of corrosion protection full-time. I just use regular tap water and top up the open-to-air bucket reservoir every few weeks using a dirty old coke bottle. This is intended to mimic a worst case scenario.
In 4 months now I have not seen a single sign of corrosion of any kind anywhere in the system.
I do not advise doing this though if you have any aluminium in your system though, even anodized aluminium. Even if you're just using all-copper, the brass barbs can eventually start to corrode, and so some form of corrosion inhibitor is advised.