WAY TO GROW PROFESSIONAL COCO® is RHP approved for horticulture and is Australia’s premium coco substrate (RHP 088BK09. ISO 9001:2008). With the highest air fill porosity and free draining formula, Pro Coco is buffered with calcium & magnesium. Pro Coco also contains trichoderma for fast root stimulation and optimum plant health. Simple, easy coco block to use and great value for money. Makes 70L of coco.