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Clorox PoolSpa XtraBlue 3 inch Long-Lasting Chlorinating Tablets go the extra mile to help maintain clear beautiful pool water. These multi-functional pool chlorine tablets dissolve slow contain stabilizer for long lasting clean control algae growth and protect your surfaces and equipment from scale and corrosion. And with conditioners added that help make your water silky smooth you’ll want to jump your clear pool everyday. Swim on Maintaining 1-4 ppm* of Free Chlorine is critical to keeping water clean and suitable for swimming. These weekly-use long-lasting tablets work hard to keep your water clean from both harmful bacteria and unsightly algae saving you both time and money. Use weekly in skimmers feeders or floaters. Always apply chemicals per label directions. Circulating pool water when applying chemicals helps disperse chemicals throughout the pool for maximum coverage.