Clorox Pool&Spa Shock XtraBlue+ w Algaeside 12 Pack $55 firm I also have chlorine tabs for sale. XtraBlue. Each bag treats 12,000 gallons of water to clear cloudy, smelly water. It will not bleach your liner or affect your waters pH level like other brands. Shock your pool weekly and after pool parties and severe weather to remove contaminants, destroy odors, and keep water clear. No premixing required and dissolves fast! Shock day or night! Always apply according to label directions. For best results, add to the deepest end of the pool with the filter running. Circulating pool water when applying chemicals helps disperse chemicals throughout the pool for maximum coverage. The best pool shock on the market, use once a week during your weekly maintenance program. Pair with the Clorox Pool app and XtraBlue Chlorinating Tablets for best results. Clorox Pool&Spa Shock XtraBlue2 for Swimming Pools, 12-pk6 in 1 multi-functional pool shock Crystal clear water Kills bacteria Improves filter performance Swim-ready in just 15 minute