Which type of chemical compound is commonly used as a pool sanitizer?

Calcium hypochlorite is commonly used as a pool sanitizer due to its powerful disinfecting properties. It is a chlorine compound that effectively kills bacteria, viruses, and other harmful microorganisms present in pool water. The use of calcium hypochlorite helps maintain safe and sanitized water conditions, essential for swimmer health.

This compound not only acts quickly but also provides residual sanitation, meaning it continues to work over time to keep the water clean even after initially added. Its stability and effectiveness at various pH levels make it a preferred choice among pool operators for maintaining optimal water quality.

Other compounds, such as acetic acid, potassium sulfate, and aluminum sulfate, do not serve the same sanitizing purpose in pool water treatment. Acetic acid is primarily used in food and manufacturing processes, while potassium sulfate is often used as a fertilizer. Aluminum sulfate can be used as a coagulant in water treatment, but it does not provide sanitation like calcium hypochlorite does. Thus, calcium hypochlorite stands out as the correct answer for its role as a pool sanitizer.