So then what you are trying to say jtroutma is that our pumps produce very little pressure.
I agree - most of the pumps we use were designed to just move water around inside an aquarium, where there are virtually no restrictions to flow (very little tubing, no blocks/rads, just a filter to resist flow)
However - given that we are all using similarily low-pressure pumps, why does this matter? All of our pumps are low-pressure, yet still we need to design a good system to have that pump push the water through so as to make it as efficient as possible. The fact that we all have low-pressure pumps is irrelivant, we're discussing (arguing, flaming, etc.) how to best use the pressure we have.
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