Water cooling systems -- whether they are a custom loop or an AIO -- all follow the same basic principles. Started 26 minutes ago I've found that works well, because the weight of the waterblock keeps the hose IN the pitcher. ZedTheIrrelevant At one point you will want to do your yearly coolant swap, or just want a new coolant color, or you will want to change liquid cooling components. Keep any eye on the water level in your pitcher, make sure  you don't start sucking air into the other end of your loop, use the second pitcher to keep the first one full enough to prevent that, but not so full that  you can't put your hand into the water without a flood. But that's just for fun and recreation, you don't  need to do that. Once everything's connected, it's time to fill up the loop. Started 24 minutes ago Now if your system has been filled before and has trace amounts, this seems to be ok, just blow as much of it out of the system as you can before you start sucking fresh water in. The way to fix this is to run the pump and fill the Res up. I also found out that if I suck most of the air out with my mouth, that doesn't work  either, the pump just sits there bubbling away not pumping. Why not just flush the loop to eliminate the air and just make a closed loop out of it, entirely eliminating the reservoir. You can also tell how your flow rate is doing now, if the water is coming out  of the block as it was in my system, it'll probably be forming a moderate geyser, if it's flowing out the other hose, then you should be able to pull that hose out of the water carefully and see water rushing out of it. Water cooling So I decided a write up on  the basics of this design would be a good idea. Now for filling your air trap T line. I've done that  and didn't get sick. While you have the pump on, slowly open  the cap you put in the top of the line, in my case, I slowly slide the bolt out  to the threaded part. I'm also wondering how you'd fill the reservoir if you use the top as a inlet instead of using it to fill? With the money you save not buying a reservoir you can buy extra fittings and valves. Also, would 140.3 60mm and 120.2 60mm radiator be enough for two GTX 670 FTW+ and i5-2600k @4.5Ghz? • A reservoir has a port on it, which allows you to actually fill your water-cooling system with liquid. Then turn the pump back on, on and off a few times, you should get all the bubbles out, make sure you have the intake nozzle below the output nozzle so  that you don't suck air back into the system just as fast as your pump pumps them out. Advertisement • A reservoir generally isn't filled all the way to the top with liquid. pretty much what w1z said but I've found a larger resevoir placed rigth after the component you're cooling (cpu/gpu/chipset) will help the water cool a bit on it's own prior to going into the radiator. This leads many people to believe that static pressure fans are the only viable choice for a water cooling. Started 20 minutes ago Now, your ready to start adding your additives. stop the pump and let the water fill the Res up from the back flow. ... steps that can send shivers down the spines of even hardened water-cooling enthusiasts. (a little bit is ok, the pump should have enough momentum to keep pumping, but too much and the pump will just stall and you'll be sucking some more. We've talked a bit about water cooling before, but prebuilt systems like the Corsair Hyr… Given I've successfully refilled my CM Nepton 120XL AiO already and managed to eliminate all the air out of it before sealing it back, I see no reason why custom assembled loop couldn't be done the same way. A bottle for precise (re-)filling of watercooling systems! The great thing about doing this in a 2 quart  pitcher is that you know almost exactly how much water is in your system. 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