GROW!T Loose Coco Coir is a natural hydroponic medium without any additional substrates. This 100% coco coir is processed and manufactured under strict quality standards. GROW!T Loose Coco Coir is buffered, treated, and enriched with micronutrients. The strategic addition of calcium and magnesium actually displaces sodium and excess potassium, creating a safe and fast-draining material. Its low EC and stable pH make this coir such a supreme soilless medium that, based on our testing, we believe it is one of the best loose coco coir products on the market today."