I see a lot of mention above about aeroponics, and I thought that it should be clear. Aeroponics is different than these DWC bubblers. Aeroponics utilizes a constant spray of nutrients water over the roots, which are not suspended into water. All the water comes from the sprayers. These DWC bubblers are a hybrid aero/hydro system, but they work more like hydro, so they are not giving anyone accurate demonstrations of what aeroponics can do.
And with that,
...