actually it even says right on the bottle that it is for hydro and i am running a bubbleponic and is working amazingSoil only, it doesn't have ph buffering so in hydro I would expect a real PITA.
Works well in soil for as cheap as it is I must admit, probably cost me $2 to veg the ladies in the pic but you will have to watch for deficiencies, in fact expect them. Keep some cal-mag close by and something with just N and follow proper feeding schedule and flush when appropriate.
It's not going to be the easiest or greatest stuff to use but will clearly work: