Revive from Advanced Nutrients is an additive that can rescue plants that have become ill. There are many reasons plants can suffer and indoor growing only adds more possibilities. There could be nutrient deficiencies that need addressing or maybe a feeding pump has failed, leading to undernourishment and under watering. Like a person that is the victim of an accident, the quicker you give aid, the better the chances of a full recovery. Revive does just that. It contains elements such as nitrogen, zinc, calcium, all in highly chelated form. this means when you give it to your plants, they rush into the roots and get to work as quickly as possible.