Each four minutes we send the water from the bottom of the fish tank through a clear PVC pipe to thin tubing, leading to the top of the 2 liter bottles and gravity allows the water to cascade through the bottles emptying into the main fish tank.

This 250 gallon tank is separated into two zones. At the top where the fish reside, we constantly filter the suspended solids in the water to keep it clear. Below this zone is a semi permeable membrane of stones, which allow the fish waste to settle beyond the stones to the bottom. This bottom zone is where the water is drawn up and pumped to the top of the plant containers.

Here you can see the water trickling down into the tank which oxygenates the environment for the fish.