that is a basic idea of how one works, or you can always look it up on youtube. I just came up with a way to make one with stuff i found laying around the farm. All i had to buy was the filter medium, i used plastic brillo pads - a package for a buck. I ended up using seashells also.
I am thinking about making another one out of a 30 gallon drum. Just need to figure a way to back wash the solids out into the wicking bed or some dirt beds. Any easier way to clean it.
Wow that is great. I will build one of those.
Current Aquaponics System
11 Gold Fish
Aquarium = Custom 90 Gallon Raised Pond on casters
Flower bed = Custom 4' x 8' Flood Table (Bell Siphon)
Bio Filter = 6 Gallon Polypropylene Tote with Hydroton (Bell Siphon)