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PCK,
I think a better analogy would be to imagine a house (pond) and an attached gararge (filter). Make a couple of windows between the garage and the house and then mount a big fan in one of them. Air pushed in the one window has to escape via the other. This would be your cirulation thru the filter. The openings need to be large and the fliter must have a high void ratio if this is to repersent any sort of saving. The second a pump like this needs to lift water more than an inch of two, the pump rate drops like a stone.
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