I got a free sample from my hydro shop about a year ago. I did use it along with my regular feedings in soil grow. I couldn't tell you if it did anything. I didn't feel it was something I needed for my future grows. I also bought some of that kabloom shit that is super bloom booster and that stuff almost messed up my grow. I have since gone with a less is more approach and wouldn't waste my money on those extra additives. I have been sticking with DG nutes and I do like the silica protekt.