Cutting Edge Solutions Bulletproof SI, 6 GallonOptimize the Hardiness of Your Plant and Heighten Resistance to Stress While Amplifying Your Yield Bulletproof Si is a part of Cutting Edge Solutions Advanced Molecular Family. Bulletproof Si provides silicon in a form (SiO2) that can be utilized in essentially any fertilizer regiment, and since Bulletproof SI is formulated without potassium, application flexiblity is even greater. The silicon form (SiO2) has shown to increase agricultural production,