That is the same with I'm using, Mega Crop (Green Leaf Nutrients) which was originally hydroponic as well. I grow outdoor and have been using it per manufacturer directions for hydroponic use and my ladies love it. Into my 3 year with this feed.
I'm sure Jack's is adequate as well, though keep a very sharp eye on the leaves for the first few days after feeding for the 1st time. If they are point out, look good and happy, keep up the way you are feeding, if not, than depending on how they look, such as loosing their green color, then add more food to the water, just a little at a time.
Good luck