GROW!T loose premium coco fiber is a superior quality, 100% natural coir hydroponic growing medium, processed & manufactured under strict quality standards. GROW!T loose premium coco fiber is a special blend of coir that is buffered, treated, & enriched with micronutrients. The strategic addition of just the Right amounts of calcium & magnesium actually displaces sodium & excess potassium, creating a safe & super-fertile substrate. Its low EC & stable pH make this coir such a supreme hydroponic & soilless medium that based on our testing, We believe it is the best loose coco coir on the market today.