Volcanic rock subjected to a process of heating and subsequent cooling abruptly and crushed to obtain gravel. It has a vitreous appearance is solid and insoluble material.
Its name comes from the town of "Puzzuoli" at the foot of Vesuvius, Italy. Pozzolana is the name given to volcanic ash and stones that come from this town, but now known by this name a diversity of rocks, and volcanic sands and stones.
It comes in bulk sizes as follows: 16-25 and 25-40 mm in diameter. In addition, it is available pozzolan black sand, smaller than 6 mm in diameter.
A pozzolana is a material of low weight relative to their size, so it provides a rustic and innovative garden. It is a suitable material for plant beds, as it is esthetic and functional. It is also the perfect substitute for grass in arid or lacking irrigation. Finally, side from esthetics function, also used basic drainage in containers and planters instead of placing sand.