What are the different forms of chlorine available for treatment?

Sodium hypochlorite and calcium hypochlorite are widely recognized as effective forms of chlorine used for water treatment. These compounds serve as chlorine sources that release free chlorine when dissolved in water, which is critical for disinfection purposes.

Sodium hypochlorite, often found in liquid form, is commonly used in water treatment facilities and household bleach products. It is highly soluble in water and allows for easy application in various treatment contexts, such as swimming pools, municipal water systems, and sewage treatment. Its effectiveness in killing bacteria, viruses, and other pathogens makes it an essential component of water sanitation practices.

Calcium hypochlorite, typically found in solid form, is also effective for disinfection and can be used in tablet or powder forms. It has the ability to store well and yield chlorine when mixed with water. This compound is often utilized in swimming pools or for emergency disinfection situations due to its stability and effectiveness.

In contrast, the other options do not represent effective forms of chlorine used in water treatment. For instance, chlorine gas is indeed a form of chlorine but is not as practical for many applications compared to sodium hypochlorite or calcium hypochlorite. Sodium chloride (table salt) is not a chlorine source