When purchasing Gibberellic Acid (GA3), the most critical factor is the purity level, typically required at 90% TC (Technical Concentrate) or higher for industrial formulation. For direct application, you should choose between Water Soluble Granules (WSG/SG), Soluble Tablets (ST), or Emulsifiable Concentrates (EC). Ensure the product has a low moisture content (≤0.5%) to maintain chemical stability and a long shelf life, and verify the solubility rate in water to ensure uniform application in the field.