how concentrated is foxfarm?

so ya, seems everyone loves foxfarm, so when i build my aero system this summer thats what ill be using, if i have a meter to read ppm so i can easily top off if necesary, will quart of the foxfarms stuff last me a good while? im thinking a rubbermaid 20ish gallon tub

Yes just use the feeding schedule chart you can print online for fox farm nutes.It tells you how much of each bottle to add at what week.Tells you how much per gallon and when to change your res.I bought quart bottle of the grow big tiger bloom and big bllom and use them in my aer system with a 50 gallon res and will have alittle left after the full grow.