This highly porous growing medium absorbs a lot of water while also providing and aerated environment for the roots, which makes it an ideal medium to be used in Botanium. This package contains enough growing medium for one Botanium. Put the growing medium in the growing container and rinse it thoroughly before you plant seeds in it. The growing medium is made from burnt clay which makes it reusable when you want to start a new grow. Simple pour boiling water on the growing medium to sterilize it and now it's good to go again.