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Old 08-03-2010, 01:24 AM   #11
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Thanks all. I have to wait on the pumps so I have a week in a 1/2 to figure it all out. Cash flow...well it flows way too quickly around here

I can't wait to see how my diy overflows work.
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Old 08-03-2010, 07:25 AM   #12
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This is what I have so far...

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Name:	Overflow.jpg
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ID:	24854



also, wondering if I attach the top 10g tank's overflow down into the 29g's, will I have to have an air hole in the 29g's or just the 10g's?
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Old 08-03-2010, 09:29 AM   #13
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OK, forget about turnover rate. You need to return as much water as the overflow takes out. That's from each tank. It has nothing to do with turnover rate, but everything to do with overflow capacity.
Assuming Sch 40 PVC thegravity flow would be
1/2" 420 gph
3/4" 660 gph
1" 960 gph
1 1/4" 1500 gph
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Old 08-03-2010, 10:42 AM   #14
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I'm using 1/2" on each tank.
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Old 08-03-2010, 11:08 AM   #15
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Quote:
Originally Posted by capj64 View Post
This is what I have so far...

Attachment 24854



also, wondering if I attach the top 10g tank's overflow down into the 29g's, will I have to have an air hole in the 29g's or just the 10g's?
I'm not sure I understand this.. why all the ups and downs? Plus the water will never reach higher then it is in the DT, i dunno how it will get over that first section.
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Old 08-03-2010, 11:31 AM   #16
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I'm not sure I understand this.. why all the ups and downs? Plus the water will never reach higher then it is in the DT, i dunno how it will get over that first section.
Its not any diffrent then a hang on back over flow. As long as you keep air out of the pipes it will not lose suction. You can you tube diy overflow and see. its quiet easy. Ive built the same basic thing. But 2 in one tank.

As for air holes. You will need one in each to start the siphon...ie get ridof the air. And prolly a hole in each cap for noise reduction.
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Old 08-03-2010, 11:44 AM   #17
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YouTube and directions on another forum is where I got the "pattern". Not sure why I have to have the first loop in the tank and not just go with the intake looping up over the tank, but all the diy I've see so far are like that. I'll have to build one each way and see what happens
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Old 08-03-2010, 11:53 AM   #18
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Alright, I haven't read the OP in awhile lol. I was thinking this was a different style overflow and was like...uh..

Post some pics when you can!
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Old 08-03-2010, 11:53 AM   #19
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The first U inside the tank is to get the water moving. You cant have a j shape cause gravity wont pull the water up to get it moving. Also the design. Keeps water in the pipe instead of air. When you lose power you need water to stay trapped so you dont lose the suction. If you went without that U shape inside the tank, when you lose power the water would reverse flow back into tank filling the tube with air and no suction. Power comes back on, no suction equals flood equal to how ever many gallons are sucked out of the sump
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Old 08-03-2010, 12:59 PM   #20
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oh, good to know. Now I don't have to test to find out

Hey, I'm doing a PWC today so I thought that I'd use it to test how my new skimmer works, like how it works. No instructions came with it, nothings marked on the skimmer so I don't know how much water to have it sitting in. Can y'all help me out with that? It's a ASM mini-G.
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