Get the ultimate in pool care convenience with this all-in-one Cal Hypo formula. It sanitizes, controls algae, clarifies, softens pool water and even prevents stain and scale to keep your pool clean, clear and ready for summer fun. All-in-one sanitizer and shock treatment. Kills bacteria and algae. Visibly sparkling blue water in 24 hours. This cal hypo based formula sanitizes and shock treats without adding cyanuric acid (CYA) to prevent overstabilization or chlorine lock.