Clay pebbles are used for various growing methods. Sometimes they are placed at the bottom of the flowerpot when growing on a soil substrate like soil. The Hydro Rokz are also used as additional drainage.
Hydro Rokz can be mixed with the substrate to make the growing medium airier, so the roots can also branch off better. Another method 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 fertilizers mixed in, and the 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 get oxygen from the top and from below. The flowing water contains much more oxygen than still water.