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Old 01-28-2012, 03:50 PM   #11
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At this time I wont be running any reactors, it will just be used as a return pump. Do you think a mag 9 would be too much? Should I go with a mag 7 instead?
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Old 01-28-2012, 03:53 PM   #12
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I think a mag 9 would be a good option. At 4' of head height with 4 90's, a check valve, a union, and a ball valve, the mag 9 will push 589gph. You could partially close the ball valve if you needed to. That leaves you some wiggle room.
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Old 01-28-2012, 04:31 PM   #13
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I would use flexible hose instead of hard plumbing the return. It will cut down on head loss. I would simply drill a small hole in the return just below the water line inside the tank instead of using a check valve. they are not reliable in salt water applications.
Mag drives are fair, but I prefer Quiet one's.
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Old 01-28-2012, 04:41 PM   #14
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Agreed flex tubing for that size application is ideal. The mag 9.5 uses 3/4". I keep my returns right @ the surface so when the pump kills, less than a gallon drains into the sump. If you want the return below the surface, drill just below the suface & make sure it doesnt clog. Just make sure you have room in the sump either way & you're fine.
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Old 01-28-2012, 04:45 PM   #15
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I have my return drilled too, but I put in a check valve that has dramatically helped with the burst of bubbles when I turn my pump back on after a water change. I know that their reliability isn't all that great, but it's nice having it. Mine has a union on each side, so that if it does fail, it can be easily replaced.
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Old 01-28-2012, 08:31 PM   #16
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Thanks for the info everyone, now its time to shop!
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