Roots Organics ROCB coco fiber has a near perfect natural pH level for optimum nutrient uptake. This coco fiber is premium aged, composted for 24 months, and meticulously washed to remove excess sodium. It has been specifically designed with increased fiber content for an ideal air to water ratio and is ideal for mixing into your outdoor potting soils or into your indoor potting soil media. Roots Organics coco fiber is composed of 100 percent pure coco fiber from coconut husks. Just add water to expand the block, which makes approximately 2.1 cubic feet or 16 gallons of media.