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There are a number of ways of purifying water. In evaluating the methods of treatment available, the following points regarding water disinfectants should be considered.

lab equipmentA disinfectant should:

1. Be able to destroy all types of pathogens and in whatever number present in the water.

2. Destroy the pathogens within the time available for disinfection.

3. Function properly regardless of any fluctuations in the composition or condition of the water.

4. Function within the temperature range of the water.

5. Not cause the water to become toxic or unpalatable.

6. Be safe and easy to handle.

7. Be easy to determine its concentration in the water.

8. Provide residual protection against recontamination.

Techniques such as filtration may remove infectious organisms from water. They are, however, no substitute for disinfection.

The following are specific methods for disinfecting water.


Place water in a container over heat. Bring it to the boiling point. Hold it at this temperature for 15-20 minutes. This will disinfect the water. Perhaps you have used this technique after a flood or when a water main has burst as an emergency aid. Boiling water is an effective method of treatment because no important water-borne diseases are caused by heat resisting organisms. Although the boiling does not remove them from the water, it does kill them and thus they will cause no illness.

How effective is boiling water?

Boiling water is an effective method to destroying bacteria and other pathogens in the water. It does not act like a filter to remove particulate matter. In fact it does not remove anything from the water; it only destroys bacteria and pathogens such as cryptosporidia, giardia, E.coli, and typhoid. Boiling will not provide any safeguard against other things such as heavy metals, pesticides, herbicides and pharmaceuticals. It will also not remove foul tastes and odors, so it is not recommended to depend on boiling water as the main method to purify your drinking water.

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Related Articles:

Water Disinfection Methods. Part II
Water Disinfection Methods. Part III
What is Solar Water Disinfection?


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