What is the difference between your hydro and aero products?

In a hydro system, the roots grow fully in a neutral substrate, which is continually irrigated with an oxygenated nutrient solution.
In an aero system, the plant grows exposed roots in a mixture of air and nutrient solution, which is also oxygenated.
The presence of a substrate in a hydro system allows you to contain any potential feeding errors and to have the time needed to rectify these mistakes as a result. On the contrary, in an aero system, as the roots are exposed, the slightest feeding error will have immediate, and potentially disastrous, consequences for the plant.