B'Cuzz Hydrogro Granulated Rockwool is extremely versatile for use alone as a hydroponic medium or as an amendment to organic based mixes. Growers can choose absorbent granules to increase available water or repellent granules to increase the air space of a potting mix. Whether absorbent or repellent, plant roots will be able to penetrate the granulate particles, thereby maximizing total rooting volume in the pot.