the megacrop folks offer and advise a booster also. They also claim no flushing needed, and I looked at their numbers and thought no way, but last couple of rounds, I have fed up until one or two last waterings, and I water every other day, sometimes everyday with the heat. And the smoke does not have the green nor heavy nitrogen that you get, especially with hydro if you don't flush. That heavy green, nitrogen taste. JME. I do use just promix/blackgold as the medium. And I almost always just use one to two teaspoons of food to water and they do great, I did try to really drop it down and got some lower leaves yellowing, but the minute I went from half to one teaspoon per gallon, went away. I am doing two tsp right now per gal, but that's not even quite a tablespoon, lol. And not what their feeding calculator says either. But its workin for me. I still love the shit. But I haven't tried their pk booster, but I would, lol