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Originally Posted by derelict
...that fill line in the drawing could be replaced by (or basically is) a res right?
... Pump (out) -> blocks -> rad -> pump (in),
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Yes, a rez and a T-line perform basically the same function. With a T-line it's easier to add water but a rez works better for bleeding. Since both of these operations are done infrequently, I prefer the easier to set up, neater T-line.
As to component order, it would be best to have the rad complete it's heat removal just before the coolant enters the block(s) so the blocks will "see" the coolest water possible, as the pump also adds heat to the coolant.
So, Pump > Rad > Block(s) > Rez or T-Line > is preferred.
But, since the coolant temp before and after the rad will only change by about 1/2*c, it may be, that in a particular setup, the added restriction of the added tubing length to accomplish the preferred component order will outweigh the benefit of using that preferred component order. Adding 3" of tubing just to get the preferred order may be counter productive, and ugly too.
Coolant:
Distilled (not deionized) water 90-95%
Automotive antifreeze (100%, ethylene glycol type) 5-10%
Iodine: A few drops.
5% antifreeze if the components are all copper/brass.
10% antifreeze if aluminum is present in the loop.