A good introduction to growing plants and fish in barrels.  Use the fish excrement to fertilize the plants, and the plants clean the waters for the fish.  A great system, although reliant on pumps, it is still fairly low-tech and can be done inexpensively.  Holds promise for some high density food growing..   

PreviewAttachmentSize
Barrel-ponics_by_Travis_Hugley.pdf3.1 MB