INGREDIENTS 100% Perlite Procision Perlite Coarse is cut with a ten mesh screen leaving all material to retain #4. Perlite ore is a naturally occurring volcanic glass containing a small percentage of water. When that ore is introduced to tremendous heat the glass liquefies and the trapped water expands creating a remarkable and versatile material. In an ongoing quest to improve the quality of our products we recognized the opportunity to begin producing another of our own materials. Success at a new venture is never easy but we're really excited about the quality of our production. HOW TO USE Original Perlite is a versatile medium and can be used alone or as a component in mixes to provide increased surface area for a balance of air and moisture. Aurora Innovations Procision Perlite is a 100% pure and natural perlite ore that is expanded with heat only, for versatile input compliance. No additives, preservatives or processing aids are used, and our perlite is never irradiated.