Which chemical is frequently added to pools to prevent algae growth?

Algaecide is specifically formulated to target and prevent the growth of algae in swimming pools. This chemical works by inhibiting the reproduction of algae spores, effectively keeping them from establishing in the pool water. By using algaecide, pool operators can maintain clear water and reduce the frequency of algae-related issues, ensuring a healthier swimming environment.

While chlorine is primarily used for its disinfectant properties to kill bacteria and sanitize the water, it can also play a role in controlling algae growth under certain conditions, but it is not specifically designed for that purpose. Stabilizers, typically cyanuric acid, are used to protect chlorine from degradation due to sunlight but do not prevent algae growth directly. Alum, often used as a coagulant in water treatment, can aid in clarifying water but isn't primarily used as an algicide. Consequently, algaecide is the most effective choice for the dedicated purpose of algae prevention in swimming pools.