A little goes a long ways.  RAW Silica contains 45% Silicon Dioxide which is the highest concentration of silicon dioxide available to the home gardener. A plant will transport silica to the site of a leaf infection and crystallize the cells around the infection to help keep it from spreading.  That is just one of its many benefits.  RAW Silica is flowable and suspend-able in water and naturally available to the plant. Since RAW Silica is a natural form of silicon dioxide, it is PH neutral and does not cloud when added to hydroponic systems. RAW Silica can be used during all stages of growth and bloom for optimal stem and cell wall strength, helping to protect your plant.