Currently i don't use bottles I've been recycled organic soil for a couple years. But when i did ive used botanicare,ff,gh,an,dyna,and a few other select bottles. Botanicare and dyna were the best for me imo because they were easy to use and actually hard to burn my plants with. The thing is, they all do the same thing. Think about a basic feed of 3-2-3 throughout veg and flower and only add secondary/micro nutes when needed. Water/water/feed/water/water/feed dont let the run-off touch the drainage on the bottom. Water till run-off and dont go crazy on the feed and you will not need a flush.