A perfect way to shock, oxidize, buffer and clarify. Multi-functional Smart Shock also kills bacteria and contains blue algae killing crystals. Swimmers can re-enter the pool quickly after treatment with this premium product that requires no mixing or pre-dissolving. Available in convenient 1 lb. bags, 2 lb. resealable bottles and 25 lb. buckets. (Use as Step 2 in 3-Step and Once-a-Week 3 Step systems.)(proprietary formulation of ingredients)