Hydroton grow rocks are a special kiln-fired, lightweight aggregate that is super-heated and formed into pebbles 4-8 mm in size. The ceramic shell and inner pore structure retains moisture and releases it back to your plant's roots as needed. Hydroton will not compact, ensuring excellent aeration for the life of your plant.
It is reusable and lasts indefinitely, making it a great value. Hydroton is excellent in net pots for hydroponic ebb and flow and drip systems.
Derived from a renewable and plentiful source (clay), Hydroton is considered an ecologically sustainable medium. The clay is formed into pellets and fired in rotary kilns at 1200C. As the pellets heat up, they fill with bubbles and form into small marble-sized units.
How to use Hydroton:
Before putting the Hydroton into a garden, you need to take the time to rinse and soak them, getting rid of any debris or dust that resides in the pores. You can use a bucket of water to moisten the pellets though you may need to rinse again.
To infuse them with nutrients, add your preferred growing solution before placing them in the garden or pot. Only use about 25% of what you normally use, since it's already going to be concentrated while it soaks into the pellets.
You should allow the Hydroton to soak for at least six hours, though soaking for up to 24 hours will yield the best results. You should notice how much heavier the pellets are after the soaking.