Hydro Rokz can be mixed with the substrate to make the growing medium airier, so the roots can also branch off better. Another method that is widely used, is growing the plants directly on Hydro Rokz. This is often done in combination with an oxygen pump. This way the roots at the bottom of the pot are constantly immersed in water with liquid fertilisers mixed in, and the oxygen pump provides enough oxygen for the roots.
Growing hydroponically with Hydro Rokz is very successful, because the clay pebbles and the flowing water nutrient solution are a golden duo when it comes to a lavish supply of oxygen. The plants both get oxygen from the top and from below. The flowing water contains many times more oxygen than ordinary still water.