Poolife NST PurifyDescription Poolife NST Purify is a powerful shock oxidizer that can quickly and easily clean your water in a single step. This oxygen based product contains a chlorinating agent, pH buffer, and dry clarifier, all expertly combined into one formula. Eliminate harmful organic contaminants while maintaining balanced water chemistry and increasing free chlorine levels. For best results, use this product alongside other items from the Poolife NST Prime