The best buffered coco on the market with a very low EC and is RHP for Horticulture certified. This not only guarantees a clean and buffered substrate, but is also a production process with respect for the environment. Gold Label Coco is an ideal hydroponics substrate: It's an organic material and a renewable resource, light and airy, can hold 8-10 times its weight in water, has a high capillary action, a stable pH and can be reused or recycled in the compost bin.