so i made a 2" overflow and spray bar

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sbuse

Feeder Fish
MFK Member
Jul 1, 2009
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With the 2" pipe I know I will be able to run something like 2400gph. I will be running anywere from 1000-2300gph through it. If I only run 1000gph through it will it loose its prime?
 
As long as there is no air in the line, I don't see why it would.

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Owens said:
As long as there is no air in the line, I don't see why it would.

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OK cool thanks. That is what I was thinking but this is the first one I made. I was just wondering if I needed to have as much flow as it can do. I have more then enough pumps but I wanted to be sure.

I am linking my 125gal and my 180gal to the same sump to have more total volume and filtration. The whole thing when done will have for filtration 2x ehime pro 3, fx5, oddassy 700 w/UV, and a 40gal+- sump. The 125 will be fully planted and there will be pothoes and other plants in the system as well. I may add a aqua top cf500 w/UV to the system as well or another fx5.

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I cut some teeth in the top of the inlet pipe my hope was that would reduce noise. I plant to add a cap to the tower and drill a hole in it to help with noise.

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Having issues keeping it primed after restarts. I also can seem to get all the air out of the system or at least i cant tell for sure. I get water out from the check valve, but it is still bubbley Any thoughts?

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I use to have the same problem and i add a vacuum pump and solved but i will drill my tank for better flow ( that means that some joint have a leak)

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Thanks, I am going to apply some PVC cement or silicone to the outer rim of the joints to see if I can get a better seal. I was thinking I have a leak in the system somewhere.

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Something else to consider.. I feel like something that is not emphasized at all in DIY pvc overflow explanations is that the difference in height between the inlet (that sets water level) and the outlet (the T piece) are almost as important as Diameter in determining flow capacity. It works like when you are siphoning a tank; the lower the outlet end of the siphon hose is, the faster it will drain. Anyway, saw that your design was pretty shallow and didn't want you to be discouraged with DIY overflows if it's performance is not as good as expected.

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lambogriffin said:
Something else to consider.. I feel like something that is not emphasized at all in DIY pvc overflow explanations is that the difference in height between the inlet (that sets water level) and the outlet (the T piece) are almost as important as Diameter in determining flow capacity. It works like when you are siphoning a tank; the lower the outlet end of the siphon hose is, the faster it will drain. Anyway, saw that your design was pretty shallow and didn't want you to be discouraged with DIY overflows if it's performance is not as good as expected.

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Thanks for that. I can always splice it lower. I have to tweak it anyway.

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