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Construction of Automatic Bell Siphons for Backyard Aquaponic Systems

Workshop: October 8th, STEM and UH College of Engineering

Bradley "Kai" Fox, Ph.D. and Clyde S. Tamaru, Ph.D. Department of Molecular Biosciences and Bioengineering University of Hawai`i

Types of Aquaponic Systems

· Raft aquaponics

­ Polystyrene sheets

· Ebb and flow (reciprocating)

­H d Hydroponic support i t media (gravel, clay balls, cinder, etc.) balls cinder etc ) ­ Timing: electronic or non-mechanical non mechanical

UVI

www.selfsufficientlife.net/category/aquaponics/

What Are Auto siphons? What Are Autosiphons?

· Control flood and drain cycling drain cycling · Start/stop automatically, a tomaticall depending on height of water of water · Bell siphon; simple and reliable

Bell Siphon Theory Bell Siphon Theory

· Standpipe: regulates water level water level

­ Connected to drain pipe

Bell cap

Standpipe Bell pipe

· Bell siphon: fits over standpipe · Bell pipe: teeth and snorkle kl

Snorkle

Teeth Uniseal

How It Works: Starting the siphon

Bell cap

Bell pipe Snorkle S kl Standpipe

Teeth

How It Works: Breaking the siphon

AIR

Sizing Bell Siphons Sizing Bell Siphons

· Larger grow bed = larger standpipe= larger standpipe= larger bell siphon · Recommended Recommended ratio= 2:1 (bell siphon:standpipe siphon standpipe diameter) · Today: standpipe is ¾"; bell siphon is 1 ½"

Installing Bulkhead Fitting (Uniseal) Installing Bulkhead Fitting (Uniseal)

A B

C

D

Bell Siphon Construction: Step 1 Bell Siphon Construction: Step 1

A B

C

D

E

F

Bell Siphon Construction: Step 2 Bell Siphon Construction: Step 2

A B

C

D

Bell Siphon Construction: Step 3 Bell Siphon Construction: Step 3

A B

C

Bell Siphon Construction: Step 4 Bell Siphon Construction: Step 4

A B

Pau

· Time to build and Time to build and test your own!

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