HTH 42056W Swimming Pool Care 3 Chlorine Tabs Ultra, Individually Wrapped Tablets, 8lbThe HTH 3 Individually Wrapped Chlorine Tabs Ultra are the ultimate all-in-one solution for pool owners who want to keep their pool water clean, clear, and comfortable all season long. This individually wrapped tablet is a sanitizer and shock treatment, killing algae and bacteria while softening and clarifying your pool water. It also guards surfaces from stain and scale build-up, ensuring your pool stays looking new. To use, simply place the all-in-one sanitizer, clarifier, algaecide, and water softener tablets in a floater, feeder, or skimmer basket to to your swimming pool. The slow-dissolving, long-lasting formula is sun-protected for longer chlorine life, dissolving slowly and lasting up to one week. These tabs are compatible with all pool types, including vinyl-lined pools and saltwater systems. For best results, use HTH 6-Way Test Strips twice weekly to test and balance your swimming pool water and keep chlorine levels between 1 and 4 ppm. With HTH, youre all clear!