HORTICULTURAL GRADE PERLITE
Perlite is a soil-free growing medium that has helped to add aeration to soil mixes for years. It's created by air-puffing volcanic glass to create an extremely light and porous material. It has one of the best oxygen retention levels of all growing media because of how porous it is. Perlite is also most commonly used as a substrate for passive hydroponics and recirculating hydroponic systems, it is also widely used for rooting cuttings and propagation.