Never heard of used it, but can see all the benefits from the products in the bag. Kelp and yucca are great fertilisers which is great for veg to early flower. The fulvic acid and amino acids assists with chelation of nutrients so can increase nutrient uptake as well as increase plants disease resistance. The carbs will be great food for microbial life within your soil which in turn will increase their population.
The packet shows exactly the dosage you should use. I recommend using it as a foliar feed (twice a week)until week 2-3 of flower and once every month or so you can feed as a soil drench.
To be safe and not cause nute burn. The weeks you decide to use it as a soil drench you could use it instead of your nutes