If you have a reservoir as part of your hydroponic grow system, aerating your nutrient solution will have a hugely positive impact.
All you need to do is run an air pump (outside the tank) and connect it to an air stone that sits at the bottom of the tank. The air that's pushed through the air stone by the air pump will keep the nutrient solution evenly mixed and fully oxygenated.
Plant roots love oxygen, and so do the beneficial microbes that colonise the root-zone. By using an air pump and air stone you will help to ensure you maximise root growth and health. In DWC bubbler systems they are absolutely essential, so it's a very good idea to keep a spare pump handy!