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, this innovative formula combines the convenience of an all-in-1 solution with the power of a pool shock treatment, ensuring your pool remains clean, clear, and inviting. Elevate your pool care routine with HTH Shock Ultra and experience unmatched performance and brilliance.