Introducing HTH Shock Ultra, the ultimate all-in-1 weekly formula with an added pool shock treatment. Experience the power of this amazing product as it increases chlorine levels, effectively kills and prevents bacteria and algae, reduces eye and skin irritation, prevents stains from metals, eliminates scale buildup, improves filtration, and softens water - all while delivering visible results in just 24 hours! Unlike traditional chlorine products that contain cyanuric acid (CYA) and can cause issues like overstabilization, chlorine lock, and algae growth, HTH Shock Ultra's fast-acting, fast-dissolving Cal Hypo based formula provides exceptional chlorination without the need for extra CYA. With HTH Shock Ultra, your pool will maintain a beautiful sparkle all season long, without fading your liner. Suitable for all pool surfaces.

• Use this all-in-one powerhouse to quickly and easily increase chlorine levels, prevent bacteria, algae, stain and scale, reduce skin and eye irritation, improve filtration and soften your swimming pool water.
• All-in-1 weekly Cal Hypo pool shock. Use weekly to solve 90% of pool problems with in 24 hours. Restores crystal clarity in 24 hours.
• Visibly brilliant sparkle. This Cal Hypo based formula sanitizes without adding cyanuric acid (CYA) to prevent overstabilization or chlorine lock.
• Visible Blue Action This built-in feature lets you know the product is working!
• Compatible with all swimming pools. This product is great for all pool types including vinyl-lined pools and salt water systems.
• You're all clear with HTH For best results, use with HTH 6-Way Test Strips to test and balance your swimming pool water twice weekly.