Pahroc Giant 4 Cu Ft (113+ Liters) Exxxpanded Wholesale Coarse Perlite Plant Root Aeration Moisture Control Light-Weight Hydroponic Soil Conditioner Extra large chunks of perlite that provide the best drainage for superior root aeration Keeps roots oxygenated and prevents plants from becoming waterlogged Use as a stand-alone product or combine with your favorite soil mix Super Course Size #3