Expanded Coco-Coir is an all-natural soil amendment that is ideal for indoor hydroponic mixes or systems. We start with the highest quality coco coir made of coconut husk and triple-washed with R.O. water to 150 ppm or less and buffered for quality results. This earth-friendly amendment has excellent water-holding and draining properties to help you grow nutritious, high quality and high performing plants.