To disinfecting the water which method is not suitable ?

Question

Accepted Answer

To disinfect water, the method that is not suitable is filtration, which is Option 2. Here's why:

1. **Filtration (Option 2)**: Filtration is primarily a physical process used to remove suspended particles, sediments, and some microorganisms from water. However, it does not effectively kill or remove all types of pathogens, such as bacteria, viruses, and protozoa, which are responsible for causing diseases. Therefore, while filtration can improve the clarity and quality of water, it is not a reliable method for disinfecting water to make it safe for drinking.

2. **Coagulation by Alum (Option 1)**: Coagulation involves adding substances like alum to water, which helps in aggregating and settling suspended particles, including some microorganisms. While it aids in the clarification of water, it is not primarily a disinfection method. However, it can be part of a multi-step treatment process that includes disinfection.

3. **Purification by Chlorine Tablets (Option 3)**: Chlorine tablets are a widely used method for disinfecting water. Chlorine is a powerful disinfectant that effectively kills bacteria, viruses, and other pathogens, making water safe for consumption. This method is specifically designed for disinfection purposes.

4. **Boiling (Option 4)**: Boiling water is one of the most effective methods for disinfecting it. The high temperature kills most pathogens, including bacteria, viruses, and protozoa, ensuring that the water is safe to drink.

In conclusion, while filtration is useful for removing physical impurities, it does not serve as a standalone disinfection method, which is why it is not suitable for disinfecting water.