Perlite is a volcanic rock that has been expanded into a lightweight, porous material. It is commonly used as a soil amendment, insulation, and in a variety of other applications. This perlite bag is 9 liters (9.51qt) and contains 3-6mm perlite particles. Perlite is a natural mineral that occurs in volcanic deposits. When heated to high temperatures, it expands and becomes a light, fluffy material. Perlite is known for its excellent insulation properties, as it can trap air and prevent heat from escaping. Perlite is also used as a soil amendment, as it can improve soil drainage and aeration. It can also help to reduce soil compaction, which can be a problem for plants. In addition to its many uses, perlite is also a sustainable material. It is renewable and can be harvested from natural deposits. Perlite is also biodegradable, which means that it does not contribute to pollution or waste. Overall, perlite is a versatile and valuable material that has a wide range of applications. Whether you are looking for insulation, soil amendment, or a sustainable building material, perlite is a great choice.