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Old 08-19-2013, 07:38 PM   #31
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Hard to diagnose. If both overflows are primed properly then at the point the water level goes above the taller unit both should be running at full syphon. My first GUESS would be that your pump is still pushing too much water for the overflows. Tweak it down some more. The short unit should be running at full syphon, the taller one should be trickling in the pipe.
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Old 08-19-2013, 07:53 PM   #32
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Based on your description your overflows aren't keeping up with your return pump. Sump probably got low and pump was sucking air. If you have a valve on the return line then try closing it a bit and leave the overflows full open.

The return flow must be less than the max combined flow both returns can handle.
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Old 08-19-2013, 08:40 PM   #33
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That's exactly how it's working lower overflow is running full siphon and the taller one is just trickling. Would if hurt to hook up one of those aqua lift pumps and let it run just for piece of mind if so could I just use one and put a tee on it so I could run it to both overflows. I can help but wonder if it was sucking air and my wife seen all those air bubbles and panicked and pulled the plug lol
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Old 08-19-2013, 09:49 PM   #34
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If the return pump was sucking air and the display tank was about to overflow then the combined flow rate of both your overflows is not capable of handling that mag24 and it is emptying the sump into the display. OR one of your overflows lost syphon. Were both of the overflows still functioning when the incident happened?

PVC overflows can work well enough but they are sketchy. A 1.5" schedule 40 PVC pipe "should" be able to do 2100gph at full syphon under gravity. But that does not take into account all the twists and turns of the overflow design. IMO, do yourself a huge favor and get a proper HOB overflow. It could very well keep a huge mess from occurring and will give you a measure of peace of mind. If you stick with the dual DIY overflows you are going to need a couple few days in close proximity of the tank so you can tweak the return just right.

Hopefully someone who has a dual DIY PVC overflow rig will show up to give you some more tweaking tips.
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Old 08-20-2013, 06:56 AM   #35
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I don't know if both overflows were working or not I wasn't home if that's the case couldn't I just back the 24 off a little more
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Old 08-20-2013, 07:59 AM   #36
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Your return pump is out running the overflows you lose a lot of flow with all those over flows I.d switch the return pump to a mag 12 or even as little as a 9.
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Old 08-20-2013, 09:22 AM   #37
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Just a thought, instead of putting a t-valve inline on the output side of your mag 24, why not put a t-split on the output, then the ball valve. This would effectively empty some flow back into thw sump. Only reason i suggest this is because it doesnt put any backpressure (unneeded) on the pump. If you restrict pumps too much it could possibly damage them down the road
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Old 08-20-2013, 05:27 PM   #38
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I now have both overflows wide open and the return valve closed a little more I think you were right when you said the pump was sucking my sump dry I have the pump about 4" off of the bottom incase something happened it wouldn't drain all 30 gallons or so onto my floor I think it sucked water from my sump filled my tank and started sucking air
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Old 08-20-2013, 05:30 PM   #39
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Huma huma you said to use a tee do I put it after the ball valve and if so where do I run the water back into the sump at do I just run it back in any where ? I think that might be a good idea
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Old 08-20-2013, 05:55 PM   #40
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Put a T between pump and valve. From the T you add some pipe back into the sump. So as you close the valve the extra water flow gets diverted back into the sump instead of adding back pressure on the pump. Also allows you to close the valve without the need to turn off the pump. You can also add a valve on the T off section to make sure all water is being sent up.

Hope that makes sense.
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