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Old 09-25-2011, 06:32 AM   #1
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all pvc overflow flow rates?

do i buy a contentious siphon overflow box from aquacave for 120 ish dollars that will flow 800gph or do i make an overflow?

how do i make something that will be 800gph like the box i can purchase for 120?

im sure most have seen this picture but it never mentions, or i cant find, flow rate.




if i have to build this thing out of 3" pvc to get 800gph, ill just spend the money for the aquacave option.



please help and i thank you
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Old 09-25-2011, 11:18 AM   #2
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yeah more questions even before i get any replies

why does the portion inside the tank have to be the same length as the portion outside the tank?

i am also thinking that if i can flow 800gph through this, i will probably still use a lift pump on the nipple/barb on the top to help keep air from building up in the pipe to ensure i dont loose siphon on a power out.
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Old 09-25-2011, 11:32 AM   #3
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The portion inside the tank and the outside do not need to be the same length my outside is twice the length as my inside if this actually effects the flow rate I have not checked that but my theroy was it gives the water farther to fall thus speeding it up and increaseing the flow
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Old 09-25-2011, 11:44 AM   #4
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cool thank you for the input! mind if i ask what size pipe you have and what your return pump is?
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Old 09-25-2011, 11:51 AM   #5
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Here is a link to the one I built Diy pvc overflow
I used 1.5 inch pvc and my return pump is rated at 1385 gph with 13 feet of head pressure
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Old 09-25-2011, 12:20 PM   #6
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thats a lot of flow! so i shouldnt be too paranoid about this and just build this thing out of 1.25" and i will be fine?

mag-drive pump rated at 800gph at 4 feet. part of that flow will be diverted to the fuge so i guess only 600gph will reach the tank.
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Old 09-25-2011, 12:25 PM   #7
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forgot my manners, thank you.
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Old 09-25-2011, 12:32 PM   #8
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Quote:
Originally Posted by coffeetwitch View Post
forgot my manners, thank you.
No problem just remember you can always put a ball valve in line to tweak your flow I actually have 3 in of them one in the overflow one in the return pipe and one in my pie going back to the fuge This is the one I mainly use to tweak mine by adjusting how much water goes back to the fuge versus the tank
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Old 09-25-2011, 12:48 PM   #9
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i guess ideally i would like it to be able to handle little flow clean up to the return pumps full gph rating with out loosing siphon.

i guess i will run that exact test when i get it all up and going.
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Old 09-25-2011, 01:08 PM   #10
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The only time mine lost siphon is during a water change once I drained it below the intake and it let all the water run out of my pipe so now before I change water I shut the vavle in the overflow to hold the water in Ive simulated power outages to check and since it never drains below the intake then it maintains siphon and as soon as the power comes back on it works like normal
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