Aquaponics what is it? - The simple answer is it's combination of aquaculture and hydroponics . Water from the fish tanks is pumped through the grow beds which are filled with gravel or some other inert growing medium. The plants growing in the growing medium extract the nutrients from the water (made from fish poo). The water then returns to the fish tank cleaned and freshly oxygenated.
I've been tinkering with different set-ups for the last 7 years utilising recycled iteems such as blue barrels, bath tubs and IBC's (Intermediate bulk containers).