I thought I would share some knowledge on how we do it.
It is remarkably simple !
Step 1: What You Need
A fountain pump
Big Plastic Pipes long and wide enough to hold plants - we use 4" (100mm) soil pipe
A Large tub - water tank
Plastic Net pots (Or ones with lots of holes in for the roots to escape out of)
pH meter or something of the sort (This is important)
Power socket x2
Nutrients (we use Canna vega and Canna flora)
Step 2: Monting the Pipes
Either lift them on blocks or mount them with "L" brackets on a wall
Make sure one end is slightly higher than the other this makes sure the water flows correctly. Decide on the lower end first be cause that is where the tub of water and the pump goes.
I mounted the pipes on the L brackets. You need a good "fall" on the pipes - our system falls 50mm in 1.2 metres, 1 in 24
Step 3: Installing the Pump
Next connect the tubing to your pipes and then lower the pump into the water. Then put the tubing in the higher end of the pipes and test your pump by plugging it in. The water should flow down the pipe into the tub at the end to be pumped round.
then turn it off.
Splashing into the tank is good, it pumps oxygen into the water which nourishes the roots.