Growstone 714233 GS-2 Mix This Soil Aerator Soil Amendment, 1.5 cu. ft. Growstone GS-2 Mix Soil Aerator is the ideal aeration component of soil mixes Its highly porous aggregates act as air pockets significantly enhancing aeration and drainage of an sphagnum peat, coco coir or composted soil-based mix As a result, it creates the ideal environment for your plants root systems and leads to healthy, thriving plants