I will be doing an aquaponics demonstration at this event using two barrels. I was just going to put a few big tilapia in a barrel and have water pumped up to a half barrel raft bed with for continuous flow. It needs to be fairly simple but does anyone have a better idea and/or does anyone want to help with this project?
How about a single barrel system,
Put a smaller access hole on each side and cut a large hole in the front and apply a piece of polycarbonate, as a window.
Use pumice or clay balls as the media and a mini bell siphon. Could be built for less than $75 depending on what needs to be bought. Should only take an afternoon to make.
Blue barrel $12
Harbour freight pond pump $10
pumice from Baker's $33
pvc parts $10(?)
You may wish to submit a large photo of your systems so Dave can have it on display.