Well, it's official.
It's going to 3/4 inch tubing.
Now all I have to figure out is why my pump has 1/2 fittings... Otherwise, the pump is at its max P/Q curve with a flow of about 250 gph (4 gpm), at which point the head is 11 feet. That converts to 0.42 atmospheres, or 4.4 meters of water, or 323 mm of mercury, or 0.43 bars, or 43 kPa, or 6.25 psi.
I'm going to try to use PVC (CPVC) parts to construct that "cube-res", starting with this:
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