NPK Industries RAW Silica, 10 lb.RAW Silica supplies high levels of potassium and silicon to help plants build stronger cell walls! RAW Silica strengthens both the interior and exterior cell walls which helps provide non toxic preventative protection against fungal infections and insect infestations as well as better internal flow of water and nutrients and greater tolerance to heat other environmental stresses. By strengthening cell walls, RAW Silica helps keep leaves and stems