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Old 06-09-2008, 04:54 PM   #11
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Question

Im not sure if i did this correctly,

I went here and calcualted that my flow rate is 413

Calculate The Correct Flow Rate

Then I saw that I have 2" from my hole to the top of the tank

So I looked at 2" from the Mag chart

Danner Mag-Drive Supreme 5 500 GPH Water Pump (Saltwater Aquarium Supplies > Water Pumps > Submersible > 500-1000 GPH )

and Mag 7 was the closest
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Old 06-10-2008, 04:19 PM   #12
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You need to stop and rethink this. The calculator you used tell you how much flow you should have in your tank from all sources (return pump and power heads).

The hole that is 2" from the top of your tank is a drain hole. It is meant to drain water from the tank to a sump below the tank. You then need a pump to return water from the sump to the tank. That pump needs to match or be rated slightly less than the gallons per hour (gph) of your drain pipe. If the pipe from the hole in your tank is 1" in diameter then it can drain 600 gph. If is 1.5" then it can drain 1200 gph. You need to find a pump that does not exceed the drain capacity. Pumps are rated for a gph flow at 0' head height and decrease in efficiency for every foot they need to raise the water to get back to the tank. A MAG7 is rated at 700gph at 0' of head height (HH) and 500gph at 3' of HH.

Does that help at all?
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Old 06-10-2008, 04:56 PM   #13
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Phew glad your here,

Ok so if my hole is 1.5inch, your saying that the flow into my sump (4 feet below) is 1200gph.

So I have to find a pump that at 4 feet head height (which is the amount of height above the pump that it must pump to) will be close to 1200 but not over 1200.


Did I understand your correctly?


If I understand correctly then, I need somthing that can do close to 1200 when it has to pump 4-5 feet upwards.

Which looking at this chart...


ImageShack - Hosting :: magpr6.jpg


ImageShack - Hosting :: mag2uk6.jpg


...is Mag9.5 or Mag12


Thanks for being patient with me, I know Im slow.
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Old 06-10-2008, 05:01 PM   #14
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Yes, BUT your diagram shows a 1" pvc running from the 1.5" drain hole down to the sump. That would normally be correct. You would have a 1.5" hole with a bulkhead fitting that reduced it to a 1" drain (600 gph). You have one 90 degree turn in there too, so that drops it by a few per cent. In this case a Mag8 would be perfect.
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Old 06-10-2008, 05:08 PM   #15
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That is correct. Mag8? Mag9 maybe?

How large is this tank btw?
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Old 06-10-2008, 05:10 PM   #16
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Its only 75g

You guys rock...
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Old 06-10-2008, 10:27 PM   #17
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wouldn't a mag9 be too powerfull for a 1" drain line? and are you referring to a mag7 I didn't know they made a mag8 is it a model other than the Danner line up? doesn't it go mag7/ mag 9.5/ mag 12 with the mag9.5 you would want 1.5" drain line
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Old 06-10-2008, 10:46 PM   #18
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FFS, yes I meant a MAG7 (SEVEN)
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Old 06-10-2008, 11:08 PM   #19
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im just gonna use a 1.5 drain line...

so mag 9.5 it is
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Old 06-11-2008, 11:45 AM   #20
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Also your return line will affect your flow rating.

The Mag pump has a 1/2" male fitting I started by adding 1/2" hard PVC pipe that adapted to a small vinyl tubing section that adapted to A flow director that had a slip on connector. I learned the hard PVC was restricting my flow because of the hard elbows. So I changed it to 3/4" vinyl tubing (you may want to do 1") So I have a piece that adapts the 1/2" pump thread to 3/4" vinyl tubing then at the top of the tank I have the vinyl tubing attached to Locline plumbing flow director setup that I ordered online. My flow increased dramatically.

Increased flow causing overflow issue there is a photo on this thread.
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