The HTH 3” Chlorine Tabs Ultra are the ultimate all-in-one solution for keeping your swimming pool clean, clear, and comfortable. This tablet functions as a sanitizer, shock treatment, algaecide, clarifier, and water softener in one, killing algae and bacteria while also softening, clarifying, and guarding surfaces from stain and scale. Simply place the tablet in a floater, feeder, or skimmer basket to apply to your pool. The slow-dissolving tabs are sun-protected for longer chlorine life, lasting up to a week. Theyre compatible with all pool types, including vinyl-lined pools and saltwater systems. For best results, combine these tabs with HTH 6-Way Test Strips to test and balance your pool water and keep chlorine levels between 1 and 4 ppm. Enjoy clear, comfortable pool water all season long with HTH 3” Chlorine Tabs Ultra.