I used it on a soil grow. It is a mycorrhizalfungi innoculent, along with powdered mollases. Not 100% on that since they dont list the ingredients. Seems like anyone who has been around a while doesnt even try a product that wont list ingredients. Probably because its easy to take a simple product and put it in a fancy package and put a high price on it. As for dwc, Idk im new to hydro. But when I used it for soil i bubbled it in ro water in a bucket, it foamed, heavily, overflowing on a small non commercial pump, and worked just fine I guess just not worth the dough. Extreme gardening.com has mycorrhizal product and im pretty sure they have one for hydro.