m0useanswered grow question a year ago I agree with Steve, not the best feed but if its all you got you can find a way.
Invest in a EC pen so you know you will not be overfeeding them. If that's not an option then just use it at 1/2 to 1/3 strength. They advertise you to use it at really strong concentrations. Plus have scheduled flushes. kinda nuts IMO.
Good Luck!