In order to get clean drinking water disinfectant is used after filtration. Disinfectant, however, is NOT used for removing:

minerals

The correct answer is Option (3)- minerals

Disinfectants are used to kill or inactivate harmful microorganisms such as bacteria, viruses, and parasites. Disinfectants are primarily employed to eliminate bacteria, viruses, and parasites from water, ensuring its safety for consumption. While disinfection is crucial for preventing waterborne diseases, it does not address mineral content. Minerals are typically removed from water through other processes like filtration or distillation, which physically separate the mineral particles from the water. Therefore, disinfectants are not used for removing minerals from drinking water.

Minerals, on the other hand, are inorganic substances like calcium, magnesium, or sodium that dissolve in water. They don't have living cells and are not affected by disinfectants.