why would the fluid permeat through the rubber or fluid dry out? never heard of this and there is no science behind it. water molecules are not small enough to permeat through rubber at molecular level. certainly the chemicals they put into the water don't react with rubber either. if eveything is air sealed then there is no reason for liquid level to dry out. inside the tube is effectively pressurised so even the likes CO2 which CAN permeat through rubber cannot get through due to pressure.
If there is a small air gap developing in one of the junctions however resulting in tiny tiny leak over time then yes, it will reduce water levels and dry out.
However I think the main problem is really not water drying out or anything aforemention, the crux of it all is the oxidation of the cold plate. while the water and the additive chemicals are meant to be non-corrosive and in a AIO there shouldn't be any air ie oxygen the metal should be completely protected. but this is never the case. the water is likely to have certain amount of ionised oxygen modelucles in it. and there may well be impurities in the water that catalyse the reaction or even trapped air within the system. so over time the corrosion of the metal will cause residual build up which will eventually cause blockage and/or pump failure.
So basically this entire thread is where @pc-guy introduces the idea that AIOs only have distilled water in them and then gets into an argument with everyone. When no one else claimed AIOs only have distilled water inside them.
It isn't just water that is in the fluid and you didn't look hard enough for rubber permeability
@Ross Thomson even tells him. Instead @pc-guy goes on to criticise Steve Burke.
Straw man. Fluid loss in general was not being discussed, the permeation of rubber by water was.
Regards scientific rigour, I've seen more of that from pc-guy than the person making the original claim, yet you're not calling them out?
I've no particular affinity for pc-guy, but some of you have some fairly profound basic reading comprehension limitations.
Where? This is a general thread about liquid loss in an AIO. Where we have empirical evidence for this. The only strawman was introduced by @pc-guy.
The second post. The very first reply was correct and the thread should have ended there.
The fluid inside AIO's can and often does slowly permeate into the tubes reducing the levels, that will affect temperatures. 5 to 7 years is not too soon for low fluids inside AIO's, my NZXT packed up after 5 years, i opened it up to look inside... it ground the bearings down into a pulp that blocked the micro fins, it did this because the bump was running intermittently semi dry from low fluid levels.