I'm trying to understand exactly what you are planning, but I'm not exactly clear on it. Is it possible for you to post a diagram to help explain what you are proposing to do.
As for needing a pressure rated pump, as long as your plumbing layout is sufficient to carry the water volume without excess friction loss, then there should be no need. If you have not restricted the flow with too small of pipe (or too many elbows tees etc.) to carry the volume then the friction loss will not be significant. It will depend more on how high you are trying to raise the column of water in the pipe. If you are returning from a sump, the water colum height would be from the surface of the water in the sump to the height of the outlet in the tank. Generally a sump in the stand should not need a pressure rated pump if the plumbing is done well. A basement sump deffinitly would.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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