A Jacks Pro Hydro Question

I was fortunate enough to be given a good quantity of 4 inch pvc pipe and have converted it into a small hydro system to grow leaf lettuces, spinach etc.

I use Jacks Pro Hydro with CalNit for my weed in hempy buckets and would like to run it for the lettuce. Anyone here using Jacks in any hydro with any veggie crops and if so, what ratios and ec?

Thanks in advance.

starke