PERFECT! ok got your attention. I started out with GH nutes when I started up the grow room again about 3 years ago. They were great, cheap and easy to use, but I knew with the light I was using I should have seen better results. I switched over to the humboldt 3 part line with the recommendation from the local hydro store guy. Had better results from beginning to end. When I went back again I decided to upgrade to the Master A&B series. Holy shit! lol. I will never switch again. Master A&B is the beez neez. Depending on how much your using its kind of expensive. But I got a huge tip for ya. I got my A&B Master gallon jug set on ebay for a hundred bucks. Wormie wanted 80 a bottle. I live like 15 minutes from him. And the prozyme which is the most used was 140. same seller 90 bucks and all 3 were free shipping. MAKE SURE YOU HAVE EVERY ADDITIVE! If you dont you will notice a difference. trust me.