Quote:
Originally posted by bigben2k
It's not terribly hard to grasp. 
Imagine a spiral block, where the channels are just a couple of millimeters tall. We wouldn't normally use a block like that, because it would be too restrictive, but for a 3 gph pump, it's ideal. Who needs 1/4" tall channels anyways?!?
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:shrug: Your going to need a massive amount of surface area to account for the lack of flow. Much like an air cooler. How is a block with a couple mm tall channels going to get that kind of surface area?