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Second, a swimmerâs body has a pH between 7.2 and 7.8, so if the. pool water isnât kept in this range then swimmers will start to feel irritation of their. eyes and skin. Keeping the pH in this range will balance chlorineâs germ-killing.
This is because chlorine is a toxic gas, and has been used as a chemical weapon. Chlorine is yellowy-green in colour, as is the image. Appearance. A yellowy-green dense gas with a choking smell. Uses. Chlorine kills bacteria â it is a disinfectant. It is used to treat drinking water and swimming pool water. It is also used to make hundreds of consumer products from paper to paints, and from textiles to insecticides. About 20% of chlorine produced is used to make PVC.