Final answer:
To remove the chlorine odor caused by chloramines in a swimming pool, the best method is to perform breakpoint chlorination or 'shocking' the pool with a high dose of chlorine.
Step-by-step explanation:
When swimmers report a chlorine odor, which is commonly due to chloramines resulting from the reaction of chlorine with organic matter such as sweat and oils from users, the most effective way to treat this issue is through breakpoint chlorination, also known as shocking the pool with chlorine. This process involves adding a large dose of chlorine to the pool water to break apart the chloramine compounds, thereby removing the unpleasant odor and restoring the effectiveness of chlorine as a disinfectant. While alternatives such as adding soda ash can affect pH levels, and backwashing filters can remove particulate matter, they do not address the fundamental problem of chloramine buildup. Doing nothing would not efficiently resolve the issue, as chloramines can persist in the water.
In conclusion, A) Breakpoint chlorination of the pool water/Shocking the pool with chlorine is the best option to eliminate the chlorine smell due to chloramines.