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Old 11-14-2013, 12:55 AM   #1
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Sump help

I am planing on building a sump for my 45gallon tank
Was just wondering what is a good GPH to have through my sump so I know what size pump to buy
Any advice would be appreciated
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Old 11-14-2013, 02:09 AM   #2
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The return flow will be dictated by the overflow size. If your overflow can move 300gph down tot he sump then you want a pump that can send water back to the tank at about 300gph.
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Old 11-14-2013, 02:36 AM   #3
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That I under stand but what size pump should I get
I have to pump the water 4and a half feet from the sump to the tank above and then I'll get an over flow to work with the pump
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Old 11-14-2013, 03:24 AM   #4
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Quote:
Originally Posted by Droneshooter View Post
That I under stand but what size pump should I get
I have to pump the water 4and a half feet from the sump to the tank above and then I'll get an over flow to work with the pump
Do it the other way around. I'm currently planning/building a sump the way you are planning and let me tell you it would have been much easier to base your pump off the overflows capability rather than try and match how much water overflows to the pump you bought.

As far as how far it has to pump if that is 4 and a half feet vertically high, get a pump that is rated for a "head" of 5ft or over. It should be clearly labelled on packaging.
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Old 11-14-2013, 05:38 PM   #5
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Ty and the whole head height thing is what really had me confused
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Old 11-14-2013, 07:35 PM   #6
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Pump rated for 5' isn't enough info. A lot of pumps can push water that high but you need to know how much flow comes out at that height. It decreases due to gravity and friction.

Do you know what diameter plumbing you will use for your return pump? That and overflow rating will tell you what size pump to use.

Google headloss calculator aquarium. There are a few. Play around with the settings. They are easy to use and will give you an idea of what size pump you need. You want to match the overflow as much as possible after headloss.
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Old 11-14-2013, 07:37 PM   #7
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And mag pumps are popular for return pump use. You may want a mag 5 or mag 7. But depends on overflow.
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Old 11-14-2013, 11:28 PM   #8
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Thank you that calculator helped a lot and one last question is it fine if my over flow box can handle more than my pump puts out
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Old 11-15-2013, 01:13 AM   #9
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Depends on the difference in flow. Too little and you will get air buildup in siphon tubes which will eventually break siphon. More flow keeps the air bubbles flushed out of the tube. Unless you attach a aqua lifter to the siphon tube. But aqua lifters aren't always reliable.

Better to get a more powerful pump and put a valve on the return line between pump and display tank to throttle the flow back to match the overflow. Fewer working parts this way.

Edit: this is assuming you are using an HOB overflow and not drilled tank.
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Old 11-15-2013, 01:23 AM   #10
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Thank you and yeah still looking at over flow boxes any recommendations would be nice
And I think I am gonna go with a mag 7 for my return pump
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