Basically im asking for confirmation for what I think I know and asking a few questions. The way I get it, the reservoir goes out to the pump, the pump goes out to the first block, the first block goes out to a second block if there is one (and so forth) the final block goes out to the radiator, and the radiator goes out to the reservoir. Is that correct? Im assuming since air is all things bad, does the resovoir need to be completely filled? as in there can be no empty space in the loop at all (the pipies and resovoir must both be completely filled at all times)? so if I ran out of coolant before the resovoir was filled id have to go get more? If this was the case, is there a way to tell when the system is %100 full? without flooding over the edge of the resovoir, lol Also, what is the most common ID and OD of tubing? also what is the official term for the things tubes are connected to? Can someone explain how the tubing fastened? I read initially that some tubing just stayed on via being stretched over the things they are connected to-which doesnt seem very safe. I see these metal "rings" everwhere but am confused as to how those are fastened. Finally, the PSU setup I find confusing. Why must you short the PSU when testing a loop? why is that any different than just turning the PC on via button? I guess you have no power supplied to you rmotherboard, but am I supposed to assume that when people short their PSUs that their graphics cards and hard drives are also unplugged? Basically, what does shorting the PSU do differently? just unplug the PSU from everything except the pump then shorting it starts the pump? is that it? Another thing, it would appear the best way to make liquid cooling systems light up is via UV, but in alot of cases ive seen UV doesnt seem to have a strong enough effect on sleeving and cables and such-is there a way to make the loops light up nicely without abusing UV cathodes? I can do one cathode, but I dont want to have to use 3 to make them look nice. Im thinking light blue UV tubing/coolant when I ask this question, by the way. Does using a block in custom loop void the warranties of any hardware under a block? like a CPU? it might be the same thing for using any other cooling system, but im not particiuarly familiar with how warranties work as far as hardware (every pc ive ever had is pretty much families old hardware that I refurbished myself, lol) Ive got a hypothetical build floating around in my head which I wont probably be able to afford very soon, but I want to understand liquid cooling completely just in case. I dont even trust myself enough to do it if I DID do this rig, but if I trusted myself enough in the future I would like to know about it. I think thats about it. thanks for your patience.