You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Water sample which is likely to contain chlorine, will affect the results of bacteriological analysis of water. Which one of the following, if added in small amount in the test tube will help overcome it – and explain in detail?
None