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<... would give me 3 pumps in series ...>
Why do they have to be in series? Don't ANY of these folks make a
viable check valve?
It's
just the easiest way to do the test. BTW, I was reviewing some old EWP
posts today, and noticed that Bob tested his pumps in series, and
parallel, and found that series had a higher flow rate. That might be
specific to his pumps, rather than a general rule, but the point was
that parallel isn't necessarily better.
Cheers,
Rusty
(can't parallel park either)