King Dranzer :
If you wan't to use the PC for over long period of time like 3Yrs + I recommend getting Koolance Liquid Coolant. Been using for years most reliable and long lasting without any problem. You can use distilled water(not simple water never do that) but the probability of it lasting over long period of time is not very high and requires more maintenance as you will have o refill the loop 2-3times(in worst cases 4-5Times) in 3Yrs.
Thanks, You say it just prevent the water from evaporation!?
I am new to open loop coolers! what is maintenance of them? if it is just refill i can do it!
My current cooler max temp is 56 when prime is working about 30 min.