I love the powdered, it is the easiest thing I have ever used. Results are perfect nothing else needed. It also lowers the Ph at 3.93 grams to about 6 so I don't need to lower it like I used to. Silica will and some other nutrients will raise the pH.
Never again. They changed. Firstly all the mealy root bugs, and other infestations made it not worth it. The last bag destroyed my plants. It was almost all wood chips and junk.
BEST LOVE them. I have 5 now. They perform at lower watts I have been doing it at 95 watts. The driver is removable I put it on top of the tent on a metal rolling tray to keep it cool.