I used the scooper that came with it it looks like around 2 tbsp so I put one scoop per gallon I have enough left for quite a few more gallons at least 4-5 was it not suppose to make only 1 cubic ft?I did not want to use to much.Awesome buddy, I also did the 2 tbs per gallon. 3 gal pots so I went 3 tbs. I'll send your the link to my grow. It's 5 white chem and 4 auto blues.