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The pump
You have to chose the smallet pump that gives enough water flow to take heat away with an acceptable increase in temperature. The most powerful the pump is, the most heat it will give to the coolig circuit, so it sould be small. I've read in some webs that bigger the pump the cooler the processor will be, it's not true, it depends on the radiator cooling capacity. On the other hand energy shuld be saved. (this is very well explained by RhoXS in this thread: http://forum.oc-forums.com/vb/showthread.php?s=&threadid=78055)
I decided to use an aquarium pump because they are cheap and are designed to work continuosly, the model I use is Sicce Micra (www.sicce.com), it's designed for a 0,5 m head, I thougt that would be enough to bleed the circuit but it's not, if it catches air you have to help the air out. It's consumption is 5 W and it's giving about 170 l/h of flow.
With 170 l/h a 1 ºC increase in water temperature supposes a thermal power of around 200 W, that is to say the flow is more than enough for the computer components.
I put the pump in glass tank because glass and aluminum are easy to glue with epoxy, this way I could put an inlet and outlet connection. Plastic tanks are difficult ot glue. It was very hard to drill the glass, the first one got broken when it was almost finished.
The tank has 3 drills: for the water pipes and one for the pump electric connection, the electric wire hole is not sealed so that inside the tank and outside there's the same pressure. The cover is needed to minimize water evaporation.
Pictures:
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Priming the circuit: you only need to make a loop with the return pipe and play with it until air goes out, it's very easy and you don't need to suck.
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