descaled / deionized water. if you use alu blocks you need additives to kill algae that will form. with copper, it is not necessary.
there aren't better coolants than water for this use. there are some specialised fluids that are way way way expensive
it is pointless to use non-freezing liquids: with watercooling the lowest possible temperature for the water is the temperature of your room. Unless you live in siberia, you are ok with normal water.
if you use phase-change and you manage to go below 2-3C then, yes, you might need antifreeze coolant,but if you were using a chiller you wouldn't be asking here :P
my pathetic case (with worklog): http://forums.bit-tech.net/sho ... =1391356&postcount=10
there aren't better coolants than water for this use. there are some specialised fluids that are way way way expensive
it is pointless to use non-freezing liquids: with watercooling the lowest possible temperature for the water is the temperature of your room. Unless you live in siberia, you are ok with normal water.
if you use phase-change and you manage to go below 2-3C then, yes, you might need antifreeze coolant,but if you were using a chiller you wouldn't be asking here :P
my pathetic case (with worklog): http://forums.bit-tech.net/sho ... =1391356&postcount=10