a tester's perspective, with a cup of coffee:
it is clear form the above, and my own investigations of mini WCing systems, that very low flow rates do exist, <60 lph (0.3 gpm), and that wbs could well be designed to operate in this range
- is this not the crux of the German/US 'debate' ?
this being the case, 0.5 gpm is too high a minimum
I personally have always included 0.3 gpm (68.1 lph) as the initial datum
- this is at the extreme of a magnetic flow meter's capability with a 1/4" (10mm) flowtube due to the low fluid velocity
to those not familiar with low flow test results, rude surprises are in store
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