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Old 02-10-2011, 09:50 PM   #1
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Sump Pump Too Strong?

so i just bought a new sump for my tank.

it use to run perfectly on my old 30 gallon sump with 3 sections.

now that im using a 40 gallon sump with 4 sections the pump empties the last 2 sections of water out way quicker than it can be filled from the overflow of the tank.

what the heck is going on? the pump is 1900GPH on a 125 gallon tank.
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Old 02-10-2011, 09:55 PM   #2
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What is your overflow rated at?
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Old 02-10-2011, 11:39 PM   #3
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how am i suppose to know
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Old 02-11-2011, 08:29 AM   #4
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This is a common problem chief. I added a ball valve to my return line so I could even out the gph from overflow to the return line.
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Old 02-11-2011, 09:52 AM   #5
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a ball valve on the exhaust port of the pump is what i would do too. btw, can you return the pump for something smaller? it seems like a waste spending the extra money on a pump and not needing it.

you said the sump has 4 sections, and 2 of them are full and 2 are empty? sounds like a sump design problem to me.
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Old 02-11-2011, 11:22 AM   #6
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a ball valve on the exhaust port of the pump is what i would do too. btw, can you return the pump for something smaller? it seems like a waste spending the extra money on a pump and not needing it.

you said the sump has 4 sections, and 2 of them are full and 2 are empty? sounds like a sump design problem to me.
the pump is like 2 years old and worked perfectly in the old sump.

the sump looks like this (ignore the dots, they're just spacers)



......1.............2............3............4
|.............|..........................|........ ......|
|..........|..|............|.............|........ .....|
|______|__________|_________________|



so i put the inlet into section 1 and pump in section 4

the pump empties section 3 and 4 faster than the water is overflowing from section 2/3

should i configure this differently?
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Old 02-11-2011, 11:28 AM   #7
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Is there any filtering in line that could me slowing the flow down
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Old 02-11-2011, 12:20 PM   #8
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no. no inline filtering. you'll just overflow the sump. i think the bubble trap between 1 and 2 might be the issue?
from your diagram, it seems impossible for sections 1 and 2 to be full and 3 and 4 empty. the only thing separating them is that half-high barrier, right in the center. i don't see how that would stop water. it should just pour over it.

how much space is in between the 1st and 2nd partitions (the ones that separate sections 1 and 2)?
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Old 02-11-2011, 01:00 PM   #9
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the space between the 2 is about 1.5 - 2 inchs.

would it help if i reversed it?

have water coming into 4, skimmer in 3, refugium in 2 and return in 1
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Old 02-11-2011, 02:14 PM   #10
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