About 1/2 bag (Approximately 20 liters) of expanded clay hydroponic growing media. Less than half price - great way to test whether or not hydroponics is for you. https://www.amazon.ca/Hydroton-50-L-Original-Fertilizers/dp/B01KYYZCWM/ref=sr_1_1?dchild=1&keywords=leca+growing+media&qid=1603391923&sr=8-1