When should i use Gravity? Does it work?

I've been having a lot of problems with a lot of my flowers turning out airy. So got some gravity. I'm in week 4 of flower and I'm in soil using general organics line. When should I apply it and how much. Should I cut back on my other nutes? I also use snow storm ultra.thanks

Never. It will ruin your batch..Locking in chlorophyl and diminishing trichome development. There a reason why it has been banned from california.

3 reasons for airy buds.

1. strain
2. too much heat
3. Not enough light

If you add some 660nm deep red and 730nm infrared light. that will make buds dense

From my experience the strain seems to be the biggest factor for dense buds. I grew several strains outdoors this year and our climate is hot, temps to high 90+, also I did not get constant direct sunlight because of trees and buildings blocking it out. During flowering direct sunlight was down to about 5 to 6hrs. After the buds dried some strains had rock hard dense buds and some strains the buds were a bit looser. All were very thick and dense when harvested. Same strains grown indoors with ideal conditions and the density of the buds were the same as the outdoor buds. With all that said i do believe that temps and light are still factors but genetics is the most important. Get some clones that have consistently produced dense bud from somebody trustworthy.

.5 ml per gal. Only one or two applications during week 5. You can add it with your normal mix. Stay under 1000 ppm while using.