A bell siphon is used in ebb and flow aquaponics and hydroponics systems in order to regulate the flow of water.  In an ebb and flow (also known as flood and drain) system water is pumped into the grow bed.  At a specific point (usually 2 inches below the surface) the water drains via the bell siphon.  When the water reaches the bottom you will hear the classic gurgle indicating the end of the drain phase.  The process will then repeat itself over and over again.  The bell siphon is a such an important part of any ebb and flow system that getting it right is crucial.  In this instructable I'll show you how to make your own, and tweak it to your needs.

Step 1: Parts and Tools

Here's what you will need to make your own bell siphon:


Gravel Guard

  • 1 - 3" PVC pipe (approximately 12" long)

Bell Dome

  • 1 - 2" PVC pipe (approximately 10" long)
  • 1 - 2" PVC cap

Bell Siphon

  • 1 - 3/4" PVC pipe (approximately 6" long)
  • 1 - 3/4" to 1 1/2" bell adapter

Grow Bed Connections

  • 1 - 3/4" Male adapter (thread to slip)
  • 1 - 3/4" Female adapter (thread to slip)
  • 2 - #18 o-rings

Drain Pipe

  • 2 - 3/4" PVC pipe 4" long
  • 2 - 3/4" 90o elbow


great help. my inner tube was to high so the &quot;bell&quot; couldnt catch enough water for suction to set in properly. it just drained slowly.<br>your advice on a proper bell-size fixed that issue.<br><br>as you can see i have a little different approach, the $1 version with:<br> - piece of 1.5&quot; pipe, lenght 6&quot;<br> - cut off 33 cl plastic bottle (for the bell), 3&quot; diameter, length 8.5&quot;<br> - cut off 1.5l plastic bottle for the stone guard.<br><br>
Nice approach to the bell siphon with plastic bottles, I like it!
<p>Love it. Great way of making one. Does it work now? </p>
<p>What is the purpose of the bell reducer coupling?</p>
<p>.doc links are not working :( error 403, that is to say that we don't have permission to download it...</p>
I'm not sure why the file isn't working; however it was very easy to make. I made a simple pattern in Excel marking each hole. I printed the document and wrapped it around the pipe to use for the template.
<p>Sorry but your page and links are just not working. It is a bit frustrating. </p>
<p>can you email me the drill template plz it says it forbiden my email is lmjservices06340@gmail.com thank u </p>
<p>I was hoping for step by step pictures. This info is available on most other aquaponics and barrelponics instructables. </p>
<p>Thank you for sharing this. Unfortunately I'm not able to download the Bell_Hole_Guides.doc, its says &quot;Request forbidden by administrative rules.&quot;</p><p>Could you please email it to me, barry_dh@yahoo.com</p><p>Thanks a lot :)</p>
<p>This still seems to be the case</p>

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