In The Swim Chlorine-Free Pool Shock – Quick Dissolving, Fast-Acting, Shock-Oxidizer for Swimming Pools, Spas, and Salt Chlorinated Pools Compatible - 6 x 1 Pound BagsBrand: In The Swim Features: Non Chlorine Alternative: Use chlorine free pool shock oxidizer weekly to eliminate non living matter, keeping your above ground or in ground swimming pool water clean and safe Proper Water Balance: Quickly dissolves to provide fast results without raising or altering pH levels Reduce Chlorine Usage: Enhances the effectiveness of the existing chlorine in the pool, reducing the need for extra chlorine in your swimming pool