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Some users complain about the taste and odour that chlorine may cause in water. Chlorine reacts with organic matter naturally present in water to form by-products such as trihalomethanes (THMs), which are potentially cancer-causing. Lantagne et al. (2008)<ref>[[#lantagne08|Lantagne et al. (2008)]]</ref> indicate that THM levels produced during household chlorination may fall below World Health Organization (WHO) guideline values.
{{procontable | pro=
- Inexpensive <br>
- Kills bacteria nad viruses effectively <br>
- Residual chlorine protects water from recontamination <br>
| con=
- Requires clear water to be most effective <br>
- May not be effective at killing parasites <br>
- Taste unacceptable to some <br>
- Chlorine forms complex compounds with organic material which may be detrimental to health over time. <br>
- Chlorine degrades over time. <br>
- Contact time is required. <br>
- Chemical dosage required varies with water quality<br>
- Chlorine needs to be purchased continuously <br>
- Chlorine can be hazardous if used improperly <br>
}}
==History and social context==