I agree on the pump thing, now. The pump I ended up with is WAY overrated for the job but is damn near failsafe. What I like about it is that it is almost perfectly silent (you have to put your ear on the case to hear it) and comes with a thick rubber housing around it (in case it shifts a bit against anything). I'm running a 1/2" system but my block is 3/8", and it has no problem forcing the water through the bottleneck.
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