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Old 02-04-2011, 10:53 AM   #1
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siphon eshopps oveflow box

I recently installed a eshopps pf-800 overflow on my 90g tank. I am however having a hard time getting it to keep a constant siphon. I always I find myself having to suck out the air everyday. Is there a recommended way to get this siphon started and remain constant?
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Old 02-04-2011, 11:24 AM   #2
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It sounds like your water flow may be too slow. How much water flow do you have? Maybe a photo would help if you can.
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Old 02-04-2011, 12:33 PM   #3
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I agree what kind of return pump are you running?
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Old 02-04-2011, 12:35 PM   #4
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Also, assuming you are using a sump what is the head height? If your pump is in the sump on the floor and your tank about 4feet. I would recommend at least a mag 9
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Old 02-04-2011, 01:10 PM   #5
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I am using a Rio Aqua 1400

Aquarium Water Current: Rio Plus Aqua Water Pumps
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Old 02-04-2011, 01:35 PM   #6
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Quote:
Originally Posted by rncarter
Yep there you go. Your return pump is not strong enough. Your return pump decides the flow of the overflow box. If your overflow is rated at 800gph, then your rio is not getting anywhere near it. I didnt look it up but i dont think that pump goes more than 300-400gph. You need to at leat match the 800 or have more so that you can have room for adjustment.

When a pump flows water upward, it loses power and the flow rate decreases. With ever foot of overhead (head) that your pump climbs, the gph output is decreases. So if your pump is rates at 375gph and it travels from your sump, 4 feet above the rim of your tank, then your final output might only be 230gph.

The final output for your 800gph overflow needs to be over 800gph. I would recommend a mag9 which is 900gph but with the four foot head should still give you around 800gph.

When there is not enough power in the overflow airbubbles are created and once it builds up the siphon will fail and stop.
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Old 02-04-2011, 02:01 PM   #7
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Yep as above.I have the same overflow box,the only reasons this would happen are:

pump not powerful enough
pump filter blocked

It is definately flow related.If I find any bubbles staying in the syphon on mine it is due to the pump filter needing cleaning,also the gargling gets slightly louder
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Old 02-04-2011, 02:05 PM   #8
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Originally Posted by six2sevenproductions

Yep there you go. Your return pump is not strong enough. Your return pump decides the flow of the overflow box. If your overflow is rated at 800gph, then your rio is not getting anywhere near it. I didnt look it up but i dont think that pump goes more than 300-400gph. You need to at leat match the 800 or have more so that you can have room for adjustment.

When a pump flows water upward, it loses power and the flow rate decreases. With ever foot of overhead (head) that your pump climbs, the gph output is decreases. So if your pump is rates at 375gph and it travels from your sump, 4 feet above the rim of your tank, then your final output might only be 230gph.

The final output for your 800gph overflow needs to be over 800gph. I would recommend a mag9 which is 900gph but with the four foot head should still give you around 800gph.

When there is not enough power in the overflow airbubbles are created and once it builds up the siphon will fail and stop.
The magazine drive is pricey are there any recommended alternative?
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Old 02-04-2011, 02:15 PM   #9
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Old 02-04-2011, 02:35 PM   #10
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Try your local fish store and see if they have any used pumps they can sell you. You can use multiple smaller pumps. You can also try craigslist, people in this hobby always have used pumps lying around.
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