trouble with DIY overflow

  • Theaggressiveoscar
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Theaggressiveoscar created the topic: trouble with DIY overflow

Does anyone have experience with this?I am having some issues, I made my own out of 3/4" pvc, I did a test to see how many gph I would get out of it and I found out that it barely does 200Gals per hour. I've read that pvc that's 3/4" thick should handle about 500gph, any suggestions on how to improve gph or should I just go back to the drawing board and start out from scratch?
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  • JasonR
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JasonR replied the topic: Re: trouble with DIY overflow

Is it a siphon overflow? Maybe you could show us a pic or sketch so we have an idea of how you have it set up....
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Theaggressiveoscar replied the topic: Re: trouble with DIY overflow

sorry about that, here are some pictures




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JasonR replied the topic: Re: trouble with DIY overflow

So it looks like you are not running it siphon flow but rather just overflow which is gonna really limit the amount of flow. In addition you are getting a lot of friction loss with the length of tubing. You'll gain some if you shorten up the tubing as much as possible, you'll gain more if you go with a larger pipe diameter, you'll gain most if you go with siphon flow.
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Theaggressiveoscar replied the topic: Re: trouble with DIY overflow

I thought this was siphon flow....I'm really confused :pinch:
So, instead of that hose should I use pvc? and I didn't add a check valve thinking I could prime it by sucking on the higher end of the tube, if I add a check valve would that help?
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JasonR replied the topic: Re: trouble with DIY overflow

It looks to me it would be capable of siphon flow but since I cant actually see it operating. So when running it the pipe is fully submerged and you are removing all the air from is and its running full flow? You should be getting much better flow if it's primed properly...
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Rocksor replied the topic: Re: trouble with DIY overflow

Having the vinyl go down and back up that high can kill the siphon flow. How well does it work if the tube goes straight into the sump without going up?
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Theaggressiveoscar replied the topic: Re: trouble with DIY overflow

when it is running on full flow it took 8mins for it to fill a 30 gallon container, so I did the math and figured it would get 200gph as it is.
Even when the pipe is fully submerged I can see some air bubbles flowing through the hose.

How would I add a check valve?I bought 2 but I don't know how to install them, do I drill a hole in the U?and then how do I get it secured into the pvc?glue?

I don't know much about this stuff....here's the link to the video that I used when I made this, I followed all steps except for the check valve part:
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JasonR replied the topic: Re: trouble with DIY overflow

"Simply drill a hole into the top of the weir and install the check valve using a small bit of silicone. Apply the silicone to the stem of the check valve. This will ensure that the nipple does not become plugged with silicone. BE SURE TO INSTALL THIS VALVE SO THAT YOU WILL BE ABLE TO SUCK THE AIR OUT OF THE WEIR. Once the silicone begins to cure, you are ready to install your DIY OVERFLOW.
Complete the plumbing to your biofilter. To begin the siphon, simply close the ball valve then suck the air from the top of the weir. Be sure to place your hand over the stack when doing this to create a vacuum."

forum.discusnews.com/viewtopic.php?f=32&t=7364
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Theaggressiveoscar replied the topic: Re: trouble with DIY overflow

Thanks!I never came across that article.....I'll get working on it right away :laugh:
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