There has been a lot a praise for the Jackās recently. I havenāt used it yet and am just evaluating the different formulations to get a feel for how itāll might act in hydro. Particular to this thread is how it buffers against PH.
They have a bunch of ānewerā formulas in addition to the 321 which may be of interest as well.
So, Iām afraid I donāt have first hand practical use with the Jackās at the moment and I havenāt dug into the micronutrient balance of 321 either. My limited glance is that it looks fine. Some folk are moving in that direction due to some of the pitfalls of MC in hydro.
There are several individuals that do have practical experience and perhaps theyāll chime in. Some folk have started a thread on it over here, as well: