Lets not start assuming that that 3GPH is going to significantly change when you start putting some stuff in a loop with it. The osmosis effect through that glass may not be moving very fast, but I would bet it takes a LOT of force to slow it down any, whereas the mag-drive pumps we use don't even physically connect the impeller to the motor - you just have to overcome a weak magnetic field to stop flow completly. As someone else posted above, these pumps could probably power some serious micro-jet type blocks.
If they could get a high enough pressure difference and pump something that evaporates a little easier than water does (add a little methanol perhaps) it might even be possible to make easy/cheap phase-change coolers that have no moving parts
Though I agree with the other post farther up about running electricity through your coolant being a bad idea - especially since your WB will likely be electrically conductive and is attached to your core.
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