I prewet cups at 300ppm (flower formula), for cracked seeds....they stay there till I got the 4th node when I top it....the topping kind of slows things down a little while the secondary branching develops more growth hormones...soon as those secondaries get moving I increase to 500ppms (grow formula)....I rarely need to go higher than 600ppms for heavy vegging, and some light feeders stay fine at 500ppms.....Soon as I flip to 12/12, I jump to 700ppms to support that stretch...They stay on Grow formula thru stretch...it supports that rapid growth better....2 weeks into flower, when stretch is mostly over, and popcorn buds are forming, I switch to a full strength flower nute...Thats about 800ppms for me....after 5 full weeks at 12/12, I drop to 600ppm for a week, then cut that about in half for the 7th week (300ppms), and withhold for last week...thats with an 8 week photo plant.....when they ARE on 800ppms of flower, there is ZERO chance of EC buildup in the medium since I water down the tube....not a big of concern with flower nutes anyways, since its excess NITROGEN that is the worse culprit when abused...many mixing charts suggest high numbers too....numbers like 1200-1400ppms (and even higher), when flowering....they know those are not lethal amts, but also not necessary and usually require flushing, and will have you buying more faster....More moderate #'s and feed every watering.....I run a 1000w HID too....someone with say a 400w would be using lower #'s....Numbers are VERY specific to the crop in question, and ultimately, you tweek those #'s based on what the plants tell you...I been using the Dyna line of products since their inception....IMO, is the BEST SINGLE use formulas on the market....no part A and B with Base formulas, just a grow formula and a bloom formula....there are SO MANY gimmick addatives on the market to get into your wallet.....They make u feel like your plants just wont do well without them.....B.S. money maker products....Any truely experienced grower agrees with that!!!
I do add Hydroguard.... Beneficials are not a gimmick....
They colonizes just fine in soilless mixes too, and keeps root systems healthier and more efficient.... YT