Grow media is both a home for your beneficial bacteria to grow in as well as a pH neutral filler for your plants to grow in. The ideal surface for root structures and beneficial bacteria. Add GrowIT Clay Pebbles into your growing space and transplant or seed directly into the media filled container. Clay pebbles are lightweight and porous for easy maintenance. Use our Grow Media Calculator to determine how many 40L bags you will need to fill your grow beds.