ZeoPro is a combination growth medium/fertilizer/soil amendment.  It makes plants perform better because of its unique patented nutrient delivery system that improves nutrient delivery to the plants.  It is a granular product that is a combination of a nutrient charged zeolite (clinoptilolite) and synthetic apatite ( a slow release form of phosphorus developed by NASA).  It is added to other growth media in relatively small quantities, typically 5% - 10% by volume.