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alsomeponics
28th July 2011, 08:23
i went to buy parts for this and i found everything except for the 2 1/2'' pvc pipe it calls for i checked several stores none has it they all jump from 2'' to 3'' my question is can i use the 2'' pipe will it still work or not?beganim
MattySEQ
28th July 2011, 09:54
the pipes used for autosiphons are 25mm 1inch
alsomeponics
28th July 2011, 10:08
sorry its the bell i need to make i ether go with 3'' pipe which would be hard to fit in the 4'' pipe or the 2'' im wondering if the 2'' would work or the 3'' maybe. please help
rmcpb
28th July 2011, 10:21
What is your actual siphon size? So long as you have 1/2" extra diameter in your bell it should work as this will let the water out quicker than the siphon can run.
MattySEQ
28th July 2011, 10:27
ah yep the bells there to create a seal it shouldn't matter to much about its size
rmcpb
28th July 2011, 10:34
You don't want it to be ridiculous though because the extra volume over the siphon tube is harder to fill and will have nasty outcomes with the reliability of your siphon. About 1/2" is good.
alsomeponics
28th July 2011, 10:40
the siphon is 1'' so it sounds like from what you are saying is 2'' will be fine but 3'' would be to big am i right?
rmcpb
28th July 2011, 13:54
Yes, you are right :)
Biggles1212
3rd August 2011, 14:50
Hi,

I use a 1" standpipe with a 3" bell. Which is fitted in a 4" shroud.

See here.

http://www.aquaponics.net.au/forum/showthread.php?t=1834&page=7

Biggles
GreenValley
8th August 2011, 08:19
try flexpvc.com for 2.5" pipe and caps
GreenValley
21st August 2011, 07:46
Also, 3" sched 40 pvc caps will fit inside 4" pvc sewer (thinner wall than sched. 40 DWV) pipe, so you could use 3" pvc for the bells. This can permit the larger 2:1 reducer that Affnan prefers - the 1-2" "bell" adapters I was able to source do not fit inside 2.5" sch 40 DWV pipe.
JonzyHick
25th August 2011, 14:57
Try playing this youtube video. I use the exact same setup on my system(s).

http://www.youtube.com/watch?v=vXaPn6SjvxU&feature=related

Have fun!!

-Jones
JonzyHick
25th August 2011, 15:05
Also, for the technical side of the "Bell Siphon" check out this link:

http://affnan-aquaponics.blogspot.com/2010/02/affnans-valve-detailed-explanations-of_9459.html

It explains a little more in depth. Use the concepts laid out in the text/pictures to fit your system.

Good Luck and don't be discouraged. It takes a few times to get the sizing right not to mention the water flow.

-Jones