Coco Coir (pronounced "Coco Core") is an RHP-certified growing medium made from coconut fiber. Coco Coir received RHP certification from Holland using the highest standards in the industry. Coco Coir can be used as-is right out of the bag or customized to each grower's garden conditions. Container size temperatures and plant size can all affect your feeding schedule and how often you water. By the addition of perlite to Coco Coir you can control how fast the medium will dry out putting you in control of your garden. Ca and Mg buffered Very low EC. Less then 0.2 Free of pathogenic germs and disease Triple Washed to remove salts Stabilized for proper ph 100% biodegradable High cation exchange capacity (cec) for optimum nutrient uptake.