If you decide to follow the GH phase feeding chart, or weekly feed chart, ignore the recomendations of FloraSheild. It seems like they recomend adding it (37.5 ml per gallon) at every nutrient change. It should only be used as a "medicine" if you have root rot problem, or nutrient lock-up, and not in combination with any other additives or nutrients. In fact Florasheild IS NOT compatible with Floraliscous (grow/bloom/ or Plus). I learned this the hard way. I wrote GH about it, they need to make it more clear. They admitted that it is a bit unclear as directed. Florasheild promotes a sterile cleansing anti-microbial environment, while supplements like Floraliscous Plus contain beneficial bacteria which is counteracted by Florasheild.

Can't stress that enough.