Growers High Porosity Soilless mix was developed for gardeners who want to feed more often. Growers HP is comprised of Coco, Perlite, and Peat, blended at just the right ratios. Your roots will thrive in this mix. PH Balanced and Inert, Growers HP allows the user to maintain precise control of their feed. High Porosity works great in flood and drain systems, automated drip systems, as well as hand watered gardens. Pair with your choice of organic or synthetic nutrients.