Chlorine is added to swimming pools primarily to disinfect and sanitize the water. Its main functions are:

1. Killing Bacteria and Pathogens: Chlorine is highly effective at killing harmful microorganisms like bacteria, viruses, and algae that can be present in pool water. This helps ensure the water remains safe for swimmers.
2. Oxidizing Contaminants: Chlorine breaks down organic matter such as sweat, oils, and urine, which can build up in the pool water. This keeps the water clear and reduces unpleasant odors.
3. Maintaining Clean Water: Chlorine helps maintain a safe pH level and prevents the growth of algae and other pollutants.

How to Identify if Water Contains Chlorine

1. Smell: Chlorine has a distinctive, sharp chemical smell. However, it’s important to note that the “chlorine smell” is often more about chloramines (a byproduct of chlorine reacting with organic materials) than chlorine itself.
2. Test Strips: You can use pool test strips or a liquid test kit, which are available at most pool supply stores. These strips change color based on the chlorine concentration in the water, indicating whether the pool contains sufficient chlorine.
3. Chemical Test Kits: Pool owners often use a more detailed chemical test kit to measure chlorine levels. These tests can identify both free chlorine (the active disinfectant) and combined chlorine (chlorine bound to contaminants).
4. Water Clarity: A well-maintained pool with appropriate chlorine levels tends to have clear, sparkling water. Cloudy or murky water may indicate low or improper chlorine levels.

By regularly testing and maintaining chlorine levels, pool owners ensure the water stays safe and sanitary for swimmers.