Locally purchased classroom aquaponics system at Paul Laurence Dunbar Elementary School, near downtown Phoenix Arizona.
Continuous water circulation pump operation
Effective ebb and flow activated by a "Bell Siphon."
Aeration by a medium volume diaphragm air pump.
4 x 4 foot growbed "deep" Media: Gravel
Link to Photo: http://bit.ly/JZJEMm
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Greetings. Just for this record, I did not build this system. The school purchased it from a local vendor earlier this year. I am just helping out providing some technical and curriculum assistance. I thought folks on this list would find the design interesting and encouraging. ;-).