I use it currently in soil, and it works great. Couldn't tell you for Hydro, but I follow the soil drain to waste schedule from their website and it seems to work well without burning my plants. I could probably get away with using more.
Thank you for the info. I got the enviroment right, feeding the right amount of nutes,light schedule but my buds are coming out leafy and not very full. Im thinking it must have been the seeds i got from a medicinal provider if not the nutrients.