BENEFITS: Boost chlorine levels to sanitize your pool water and kill harmful algae or bacteria for clean swimming USE: Apply to swimming pool water as directed to attain proper chlorine levels for safe swimming COMPATIBILITY: Great for vinyl-lined pools; Works with fresh and saltwater systems FEATURES: Kills bacteria and algae; Crystal clear results in as little as 24 hours; Fast acting and fast dissolving INCLUDES: One 1-lb bag of pool shock treatment that treats 13, 500 gallons of pool water Power Source Type: Manual