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Old 02-19-2010, 09:17 PM   #1
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mag 18 for basement sump

Hi! Iam planning to build a basement sump for my 130 gal. The pump will be approx. 10 feet from the bottom of the aquarium, with the only 90 being the one that comes out of the sump. I was looking at getting this mag 18(linked below). WIll this work? I dont know what my overflow is rated for, and dont know what I have to do to figure that out(it is a custom made tank) Any help is appreciated. Thanks.

Danner Mag-Drive Supreme 18 1800 GPH Pump - eBay (item 180412050942 end time Feb-22-10 11:20:03 PST)
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Old 02-19-2010, 11:57 PM   #2
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Do you have a single overflow or more? Is this a prepdrilled tank?

Every overfllow will drain x gallons/min. You want to match a pump to that rating withouht exceeding it. To do that you need to account for the head height (distance from pump to where the return hose enters the tank.

That pump is rated at 850 gph at 10'; 825 @ 11'; 750@ 12'; 650@ 13' . . .

You need to add a loss of 100gph for every foot of horitontal run (if you have 2 overflows) and count every 90 degree elbow as 2' of loss.
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Old 02-20-2010, 04:57 PM   #3
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Thanks for the reply. The tank is drilled with 1 overflow, it has two return lines.(I have added a picture below so you can see what im working with, excuse the terrible paint job..lol) The line from the sump will split just below the tank inside the stand. How can I figure out the overflows gph?
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Old 02-20-2010, 04:59 PM   #4
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Forgot the pic..
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Old 02-21-2010, 08:57 AM   #5
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What size is the drain? You will get aprox 600 gph from a 1" line and aprox 1200 gph from a 1 1/2" line.
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Old 02-21-2010, 03:36 PM   #6
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It is inch and a half. Will 850gph from the pump be enough to keep up with it or do i need to pick a more powerful pump?
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Old 02-21-2010, 03:40 PM   #7
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It does not look like it. As Larry said you have 1200 gallons coming down and only 850 going back up. I guess you could make it work if you had a ball valve that controlled how much was coming down to equal your flow going back up. That`s what I have on my tank even though it`s not down in my basement.
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Old 02-21-2010, 03:55 PM   #8
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Do you think If I start with the 1.5 inch pvc on the drain and taper it down to 1.25 inch pvc that it would equal it out?
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Old 02-21-2010, 03:58 PM   #9
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Maybe but a valve will make it so you can always control the flow.
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Old 02-21-2010, 04:00 PM   #10
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Yeah, you got a point there. Thanks for the help guys.
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