I would advise strongly against using superthrive. I grow in hydro and we used this stuff for the first time on this grow. We tried first with adding it to the nutrient mix in very very small quantities so that it would help growth. Growth did not speed up, nor was the nutrient solution unhampered either. The nutrient solution got disgusting very quickly and smelled horrible and was very chunky. Superthrive smells vaguely reminescent to urine and I wouldn't doubt it has urine in it. Our second test consisted of pouring superthrive directly on the rockwool cube in the hydro basket and this killed the plant over night. I probably used a bit much, but in terms of marijuana and any type of horticulture, I don't think any product should possess enough potency that is kills a plant over night. Never helped me so I will never use it again!