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Seriously just use a fillport like guru said. Really no use of having a closed loop with the use of a bucket.
it will work... you're gonna have to do some tests and engineer it well tho... of course, as gurusan said an extra 50 bucks and you can have the proper setup.
and btw, water does expand and contract with heat (ie its reaches its maximum density at 4C, either side its density is lower... lower density means greater volume), but it is incompressible... but no, this expansion/contraction won't be a problem (it isnt in any other setup... this one just has lots of room to expand and contract)...
your main problems will be corrosion and contamination, because there are gonna be alot of airborne minerals and other contaminants that are gonna hinder your coolants heat transfer ability... so personally, i wouldn't recommend this method
The main reason for me wanting to do it this way rather than use a fillport/res is that this way there is no air in the system period. So when I lay my PC on it's side or whatever orientation air won't get sucked from the res into the pump. I move my PC very often and I move it with it laying on it's side in a car seat.
If you can think of other solutions they're welcome here.
It won't work.
Tubing is porous and coolant will evaporate at a relatively surprising rate.
There are ways around this like using radiator fluid instead of water, or using special non porous tubing however it really isn't practical.
A t fitting, foot of tubing, and a cap won't run you more than 5 bucks.
Read up on water cooling before you consider it because you don't seem to know all that much about it yet.
Fill your t-line up all the way maybe...
The system will still evaporate some. I have to add water to my "closed" system every few months anyway. Technically pretty much all watercooling loops are closed systems. There may be air in the system in the res, but no new air is introduced into the system after i bleed it and put the cap on the res.