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What kind of overflows do you have? 1 1/2" Megaflows should handle 6-700gph. If you have a return pump with a higher flow rate than your overflows will handle just put a ball valve on the output side and slow it down. This will also reduce your watt draw from the pump. This way you can acheive the max flow possible from your return pump.
Most people with high flow rates achieve it through the use of powerheads (tunze, vortech, modded maxi-jets) not through a super strong return pump. You don't want to reduce your dwell time in your sump too much.
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