if anything at all, it adds oxygen and moisture holding proerties to your soil. so it drains better, and reatains oxygen a little better.

Perlite is really a much better option with soil.

You could fill entire pot with hydroton, as long as you had a tray to retain overflow, making it available to plant between waterings. Using this method...you pre measure solution. Peace
latewood Reviewed by latewood on . Hydroton Clay Rocks Question I know hydroton clay rocks are good for topping but can I also use these rocks for drainage at the bottom? and any benefits in doing so? Rating: 5