What it is
A vertical aquaponic system grows vegetables without soil in columns above a fish tank. By growing vertically, you can produce about twice the amount of plants as you can with a hydroponic system of the same area. One five-foot tower can produce more than 200 heads of lettuce per year. And it uses a small fraction of the water needed to grow crops in soil.
The system puts fish waste to work as fertilizer for crops. A small pump draws nutrient-rich water from the fish tank to the tops of the vertical columns. The water trickles down through the roots of the plants, gathering oxygen from the air as it falls back into the tank. It releases almost no waste and, because it's soil free, there's no need for fertilizer or most pesticides. Also, if you do it right, you won't have to clean the fish tank much.
You do have to replace lost water as needed, power the pump and feed the fish. Try raising crickets for fish food, or buy them flakes. It might not be too hard to power one of these pumps with a small solar panel or some other renewable energy. If anyone has an idea, please share.
This is how to build Sean Brady's low-cost vertical aquaponic system This build is for the simple design in the cover photo, and we're including pictures of other, fancier systems built with mostly the same materials to show what's possible. For credit, Brady took all of the photos.