how long shoud I us a pk booster I am trying out this crystal burst

by humboldt countys own ,started using the pk at week 3 with a whole line View attachment 3019936of other nutes,,

at lower dose then whats on the bottle,, please help feed back needed this is gsc thin mint cut ,, day 31 flower

I am trying to get the best quality I can ...

Don't you just love that metallic taste....flush well before harvest, you may not notice it ....lol