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Its not that bad. Its kind of a waste, as having dual overflows with this method is a bit useless, but if you changed the right overflow so that it has another primary (dual primary lines that 'T' together with a one valve to control them both perhaps and identical height standpipes), then you have the two 1" ones left, and the one in the right can be the return (1" is enough for 1500gph if you want), and the 1" in the left can be the backup standpipe. That way, the flow through both overflows should be about as close to equal as possible, and the right overflow will only be backed up if its primary isnt enough (gets clogged)... which should be rare if ever.
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"If at first, the idea is not absurd, then there is no hope for it"
-Al Einstein
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