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Old 08-15-2014, 09:54 AM   #21
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Well if I would make the cuts the short way across the pipe about 3/4" deep, that would make the pipe have teeth. What is the purpose of teeth on a overflow? Just to skim the surface a lil deeper?


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Old 08-15-2014, 04:21 PM   #22
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The teeth on a vertical overflow allow water to flow through, while preventing CUc and fish from simply swimming over the weir. I don't think that would be a problem with the horizontal pipe. But the teeth would provide a larger drainage area, meaning you have to spend less time digging out colonista snails.
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Old 08-15-2014, 06:10 PM   #23
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I was thinking that 1/4" is too wide and I should go 1/8" every 1/8", 3/4" deep. Will I have to clean the inside of that pipe? I plan on it so I will have to make it so I can take it apart. What do you think?


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Old 08-17-2014, 06:35 PM   #24
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Here is my prototype!Click image for larger version

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ID:	247092 I went with 1/8" every 1/8", 1/2" deep. I appreciate any questions, comments or constructive criticism.


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Old 08-18-2014, 07:34 AM   #25
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I think you'll need the 1/4 in spacing but let us know how it works. Looks good. Hows the flow rate?
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Old 08-18-2014, 08:50 AM   #26
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Don't know yet on the flow rate, hope to drill my tank sometime this week and set it up to see how many gph I get. What do you think the issue will be with the 1/8" spacing? I could easily nip off every other tooth with the table saw. I'll definitely let you know how it works


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Old 08-18-2014, 02:03 PM   #27
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You will be limited to a maximum gravity flow rate based on the pipe. Assuming you are using 1.25" ID pipe, the best you can get is about 1500GPH. 1.25"OD is 960 GPH. Of course you may need to do something to silence the drain, reducing the flow rate some.
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Old 08-18-2014, 03:04 PM   #28
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Yea I was wondering about the static pressure on that type of overflow. It will basically just have very little pressure and have a siphon effect going to the sump. How gph of water should I have going thru that 46 gal tank with a 20 gal sump. Will it hurt if I don't have the recommended turnover?


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Old 08-18-2014, 03:05 PM   #29
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I am using 2- 3/4" sch 40 lines for my drains, btw.


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Old 08-18-2014, 09:33 PM   #30
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One question Click image for larger version

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ID:	247256 should I have a tee with a vent in place of that top 90 elbow on both sides. If so should I vent every elbow like that?


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