The irritating thing about water cooling is maintenance and upgrades you can't just do something it has to be planned for.
When l serviced my custom loop after 2 years[new coolent+tubing] was using EC6 Clear. The coolant was still clear and no aliens floating around no change in temps. I checked my CPU Block, no build up just a bit stained as l changed GPU in that time. I topped the loop up a couple of times during the 2 year period and when l changed the GPU.
Building my loop l mounted the rad externally making it easier to install + maintain. Now using EK Clear about year old, still looks clear no aliens, no reason it should not last 2 years again with the tubing..

