SST 28% Silica is an advanced form of foliar silica containing a revolutionary form of plant available Silica. SST 28% Silica has a low molecular weight for enhanced uptake and is manufactured to be stable at pH ranges as low as 3. Even though SST 28% Silica has a very high silica content, it can be fully incorporated into most spray tank mixes. It also has a neutral pH and low salt index making it extremely safe on turf.