Our Fresh 'N Clear Chlorine-Free Shock comes in multi-packs for ease of use as you eliminate contaminants, organic waste, chlorine odors, and prevent algae while freeing up existing chlorine in your pool. Dosage: 16 oz per 10,000 gallons. Chlorine-free shock Eliminates contaminants and organic waste Eliminates odors Prevents algae Frees up existing chlorine Fast dissolving Non-chlorine shock doesn't change pH levels Safe to swim in 15 min. Works in chlorinated and brominated pools