GS-4 Moisture is a ready-to-use Growstone? Coco-Mix designed for hand watering with triple washed coco coir and added beneficial microbes (Xtreme Mykos). This blend holds water while maintaining excellent aeration, eliminating compaction and preventing overwatering & root rot. Growstone? manufactures products for the horticultural industries like hydroponics, aquaponics, green roofs, vertical walls, water filtration and other markets making use of recycled glass that would otherwise be buried in landfills.